Question about weight loss/emotions...maybe correlated?

I will preface all of this by saying I had gastric bypass in June 2009. I lost from 300 lb to 112 (so, I lost way too much). I was 5'3, I'm now a hair under 5'4 due to spinal decompression from the loss. I have maintained most of my loss except for the regain that I'm currently trying to get off again. I regained 40 and I'm trying to lose 30, because 112 was horrible on me. As a result of the surgery, I am (diagnosed) reactive hypoglycemic, lactose intolerant (anything more than a string cheese or a few oz of milk in a modified latte I have Sbux make gives me stomach cramps so bad I feel like I'm dying), and have issues with gluten. I have to eat low carb or I literally have a hard time getting out of bed, I pass out from the reactive hypoglycemia, it sucks. Anyway, complaining about the surgery is a whole `nother post.
When I was first post-op in 2009 they warned us that our emotions could and would get crazy, that losing weight so quickly releases estrogen and other hormones from the depleting fat stores, and some other things I can't recall from memory right now. And it was true- everyone in my support group had the "crazies" for about 6 months or so, then the volatile-ness went away. I had it, maybe for a few months, and then it faded out.
I'm not typically a cyclical emotions kind of person, and I've noticed that since I cracked back down on losing weight and got serious about my low carb again, spacing meals out, moving more, etc. I am crying a lot more, sad a lot more, all of it. My husband is noticing it. I should add I am losing weight at a ridiculous clip- I'm down about 22.6 lb in about 4 weeks. Since the surgery it is always like that, though, I lose it quickly and can put it back on quickly as well, albeit not as fast as losing. Went to the doctor- I'm not diagnosed with depression and the surgeon seems to think it's related to the quick weight loss.

Any ideas? I'm almost 31 (next month), 1 child who's almost 2 if that helps, I'm a hair under 5'4 and weigh 136. Pretty sure I need to slow the loss down, but not sure how to really, I tried adding carbs in yesterday a bit (from 2 apples and a half mini bagel) and feel awful this morning and am getting the typical reactive junky feeling. I drink a lot of protein shakes and eat Quest bars (which I know is bad right there) because it's a decent amount of protein for the volume, i.e. I can drink a shake a lot easier than I can handle 3 oz of meat in my stomach to get the equivalent protein. I simple can't handle a lot of volume in my stomach.

I do TDEE-% and according to my Fitbit my TDEE is anywhere from 1850-2100/day. My calories are about 1200-1400/day.