HRM says I've burned over 3000 calories today...

If you are gaining weight instead of losing weight, you are taking in more calories than you are burning, regardless of what your HRM says. How long as the gaining been going on?

I'm not seeing your diary. As for your calorie burn, of course, I have no idea of your height and weight, so I can only look at myself, but my total daily energy expenditure is about 1800 on a GOOD day, when I have put some effort into that treadmill and logged over 10,000 on my pedometer.

You might use the TDEE calculator at http://www.fitnessfrog.com/calculators/tdee-calculator.html to get a rough idea of what your expenditure might be.

Then you are a lot like me. . . I'm 5'1" and 128 pounds. I wear a fitbit and try to get 10,000 steps in every day, though I don't always quite make it. I try to do 30-40 minutes on my treadmill most days, but I don't aways. My fitbit often shows my calorie burn at about 1600 at the end of the day. fitnessfrog calculates my tdee at 1650.

My BMR is 1120, so I'm currently eating 1200 calories a day. I'm losing between .5 and 1 pound a week.

One thing to think about is that as you lose weight, you need fewer calories. If you are stalled, you might try cutting 150-200 down and see what happens after a week.

I seriously don't know how to begin to survive on 1200 calories a day, I feel like I'm starving at 1600. I eat decent foods, this morning I ate 1 whole egg, 3 egg whites, black beans, spinach, a cup of kashi 7 grain puffs with a cup of whole milk and a half hour later I'm watching the clock for the next time to eat.... I do this every single meal.... and no matter what I eat I never ever feel full.... it's so frustrating

You don't log dinner - is that because you don't eat it ?

I noticed the 8 ozs chicken pigouts at lunchtime and from the above it sounds like you're eating too much and aren't particularly in control of it. Breakfast cereal carbs will give you blood sugar swing, without them and the milk you probably would not have been hungry. A two egg omelette with the spinach and beans would do me for a morning,

Regarding the HRM, have you set it up for your personal fitness level ? If not it may be overestimating 30% or more. Hopefully you're aware that they estimate the total calories including your RMR etc and that the estimate is debatable at low heart rates.

Your not eating enough protein if your hungry a lot, up your protein intake, cut out carbs eat clean more fresh veg and fruit, and always take 20% off your calorie burn, everything is estimated. if your outtingon weight you are over eating and not active enough.

I ran your numbers. You should lose well at 1300-1500 calories per day. If you have stalled make sure you are not under estimating calories (weigh and measure food) and over estimating calories burned from work outs. If you chose moderate activity factor do you work exercise 1 hr a day 5 days a week at a moderate heart rate of 150? Have to be quite accurate on both calories consumed/burned because 200 calories a day off and you will stall.

As for being hungry all the time there are 2 approaches. If you want to keep insulin levels from spiking eat every 2-3 hours with a balance of complex carbs and protien. This works for some people. The other thing to try is Intermittent Fasting. You cram your meals in a shorter window of time but each meal has a lot of calories to help you feel full.

The main thing is you stay within your calorie range, but if you want to help with the hunger pains try to cut down on processed carbs. They will spike your insulin levels and an hour or so later you will crash and be ravenous. Protien and healthy fats make you feel full and provide even consistent energy.