Feeling fatigued

First I would check your setting. Are your settings set for sedentary active or very active. Do you eat the calories you burn through exercise? If you are at 1200, burn 400 that only nets you 800 per day!! No wonder you have no energy. So:

1) Eat the calories you burn through exxercise
2) Up your protein intke
3) Verify your settings so that they are accurate.

Good luck and keep us informed here. We all are cheering for you to succed!

I've read stats before that most people(the average American) can lose weight eating 1800-2000 per day. This is if you haven't slowed your metabolism by eating much less for a period. You may need to transition to eating more for a little bit(eating at maintenance) to get your metabolism up to working well again, and don't worry about any gain in that time, just focus on how much stronger you feel getting better nutrition while still being active. Because of the high calorie counts in restaurant foods and pastries, many people were eating far, far more than 2000 cals, probably not realizing it and eating calorie dense things, at the time they gained weight. So even eating a 2000 calorie diet is a big reduction for most people.

Remember some athletes can eat 10,000 calories a day and still be fit(an exception, like Michael Phelps, tall and a man, so not like us, smaller and female) but still it proves a point - 2000 calories is not especially much for a woman who is on a fitness plan with significant activity every day. It's about what I'm eating myself and I used that plan to lose the last few pounds. When I was eating less, I felt weaker too, and actually noticed a significant loss of muscle during my strength training, while also feeling bloated. You have to trust that eventually your metabolism will even out if you give it a chance and eat enough to fuel your workouts.

check out fat2fitradio.com/tools and look at the BMR option.. It tells you your BMR (calories if you never got out of bed) and what to net for goal weight. It helped me to adjust and not be tired anymore.

I would make sure you change your setting to reflect your exercise and it will give you more cals. I always try to leave 300 cals not eaten. With exercise I go between 1600 cals to 2400 brunt.

MFP recommends "lightly active" for an office job as I recall(I believe it had it in parentheses next to the category). Even if you aren't on your feet all the time, you are typing, filing, getting up to use the copier and walk over to colleagues, opening supply boxes, etc. It is not the same as if you were on the sofa watching tv.

I am on maintenance, with over 1600 needed to maintain my current weight(114 lbs) - I changed my MFP setting to moderately active because I exercise every day of the week, including strength training every day, and that raises my BMR even at times when I'm not moving(strength training does that, and it's not otherwise factored into calories burned. So MFP will say I need to eat 2400 calories to maintain on a very high exercise day! I don't eat all of that, but usually about 2000, and I sometimes slip below 114, but am generally maintaining.