Just want to be normal :(

I lost 10kgs eating 1200 a day through Lite n Easy.

I went up to 1500, started to gain. Went back to 1200, lost a few more kgs. Then began to obsess so stopped counting, hence why my diary is blank for the past few weeks. I'd say i'm probably eating around 1500 ish a day now. My HRM shows i burn 1500-1700 a day just working and daily activities.

So you were on a VLCD (very low calorie diet ) for your body weight, height, age? For how long? If you were on that for any length of time you have very likely messed up your metabolism a little. Given what you are saying..that you started gaining at 1500 it makes sense. For your current weight as listed in your profile your BMR is close to 1500 - or it would be in a normal situation. This means that everything you do ABOVE laying in bed all day (so anything) needs more than 1500 calories.

In order to get back to 'normal' you will need to try to reset your metabolism. From a post last year by mommamuscles (I am not sure if this was the original source but it was good advice)

Heres some basics:
1. If you're coming from a VLCD, start with a metabolism reset, eating TDEE for 6-12 weeks (basically, until weight gain stabilizes)
2. If you are not coming from a history of VLCD, or once you have finished your reset, you will move onto your cut phase (provided your goal is weight loss) which is TDEE -15%.
3. Every 6-8 weeks, spend 1-2 weeks (personal preference, or when your weight loss stalls), eating at TDEE.
4. Ditch the scale in favor of the measuring tape and progress photos.
5. Dont overdo exercise, but do use it to accomplish your fitness goals.
6. Weight training is not "required" but is highly recommended as building muscle will assist with fat burning.
7. Clean eating is also not "required" but is highly recommended.
8. Recommended macros are 40/40/30.
9. Make sure you are calculating your activity level appropriately, using HOURS of activity, not calorie burn. Strength training most definitely counts toward your activity level.
10. If you net under BMR, you must eat those extra calorie goals so that you are not netting under BMR. One or two days of netting under BMR over the course of several months is not going to be a big deal. However, one or two days per week will affect your metabolism.

Basically, if you are gaining weight eating an amount of calories that 'should' be too low for your stats (which you are) then you can make a reasonable assumption that your metabolism is no longer normal.

My ENTIRE life was spent eating very little calories,

My whole life day in day out was Vegemite toast for breakfast, sandwich for lunch, meat and veg for dinner, and maybe a piece of bread after dinner, no snacks. This is how I've always eaten, no snacks, no appetite, yes alot of bread but doctors always said it's okay to have up to 5 pieces a day, so we did what the doctors told us. A doctor actually told my mum while I was little to feed me more sugar because I wasn't growing and sugar would help!!! (so angry about that)

Then when I did Lite n Easy and they suggested the 1200 cal plan, I was actually eating tons more, to start with I had to skip some of the snacks because I couldn't fit them in, eventually I became hungrier and was able to consume more, I lost 10kgs in 4 months, no exercise, kept it off so far. I stay with LnE for an extra two months because I plateaued, realised nothing more was coming off so decided to go out and do my own food.

someone mentioned cutting on the rice, I've probably only had rice two or three times in that 2 week period.

As for Genetics, my ENTIRE family is over weight (parents, brother, aunties, uncles, cousins, all of them).

A personal trainer told me I should consume LESS than my BMR. I didn't listen to her for a second, but can you see how I'm confused, one person says do this, another says do that, I'm terrified to do anything because one kg put on is just one kg in the wrong direction.

If you aren't using the diary, how do you know how much you are eating?
Even professional dietician aren't very good at knowing how much they eat unless the weigh, measure and log.

I eat the same thing every day pretty much, I'm eating what i used to eat when I logged, I'm just not logging it.

You gained nearly 1KG per week???

Yes.

This is what I mean, I've always gained like this. I once gained 10kg in one month because I was out with friends every night and therefore snacking more, but I was also walking everyday for hours. This is not an over exaggeration. I'm being completely serious, I've gone to my doctor for years, she doesn't even want to do a hormone test on me even though i've asked several times.

I've recently gone off the pill in a bid to try and get my natural hormones back in order, I suffer almost every side effect of the pill including the constant fatigue.

If you have constant fatigue, you should have your thyroid checked. Gaining weight is also a sign of a sluggish thyroid. I know firsthand!

Checked. According to my doctor I'm within the "normal" range. I also had my cortisol tested and although my cortisol levels were very high, they were not high enough for my doctor to think it was worthy of medication. So my cortisol is higher than the average person but not high enough to deal with.. To me that means, yes your cortisol levels could contribute to your weight gain but because it's not extreme we wont do anything about it.