Comma, so sorry to hear what you're going through. The stress of it all sounds pretty overwhelming and it sounds like the most difficult aspect is the feeling of a lack of control - over your circumstances, of course, but also the fact that you feel driven physically in ways that you weren't when you were eating a diet that was more ideal for you. Your blood sugar, insulin levels, cortisol level, etc., are probably all over the map, thanks to the stress alone - not to mention the contribution from the big change in diet.
For the time being, control only what you can, accept that which you can't and make stress management your number one priority. Things will calm down and you will feel much better as you gain familiarity your current circumstances and are able to affect more of what is going on in your life. You are strong and you will get there!
Life is not a matter of having good cards, but of playing a poor hand well.
- Robert Louis Stevenson