I have to chime in and agree with the posters who suggested talking to a doctor about sleep medications and getting evaluated for depression. I've struggled with depression most of my life, and my constant thinking/obsessing/worrying kept me awake. When my psychiatrist prescribed Ambien, I was reluctant to take it, afraid I'd become dependent. But still I'd lie in bed worrying that I wouldn't get enough sleep, and that tomorrow I wouldn't sleep either... stress about sleep kept me from sleeping! (along with all the other things running around my brain.)
He finally told me, "You HAVE to sleep. You won't get better until you sleep." And that made sense. I started taking the medication, I started sleeping, my mood improved, my body learned how to fall asleep, and eventually I was able to sleep without the meds.
I was out and up too long and late last night, and feel really tired today. And I've noticed that it is harder for me to concentrate, and definitely harder for me to stay on plan, eating-wise. Its just so hard to think clearly and make good choices when I'm tired, hard to control negative thoughts, harder to do everything. When I was constantly sleep-deprived, its no wonder that I struggled so hard through the day. You, too!
There is a lot of good advice out there about how to get better sleep habits- go to bed at the same time, only use bed for sleep or sex, avoid alcohol and caffeine, etc. Those are helpful tips, but they didn't work for me when I was chronically sleep deprived and depressed or anxious. I couldn't turn off all that buzzing in my brain, and the less I slept, the louder the buzz.
If you get some sleep, you may find that your emotional upheavals ease up. If you find you are still struggling emotionally and choose to try any sort of therapy, you will have better results if your brain and body are rested.
Being a therapy-sort myself, i wonder if there is any significance to the fact that you are now back to the same weight you were when the experiences you are reliving occurred. Its something you have noticed- it might be something to explore. You might try writing your thoughts about that, and see what comes up.
Try not to be too hard on yourself- you are going through a big emotional journey, and lack of sleep throws everything out of whack. Getting the rest you need won't fix everything, but it will enable you to take the steps you need to keep working through it. Take whatever help you can!
(oh, geez, I just realized how long this post became. maybe reading it will put you to sleep!)