Hey Layne. Sorry to hear you are struggling. I don't have any experience with spice, but I wanted to at least welcome you and let you know you are not alone.
Sorry to hear you did not have much luck with the doctor. It sounds like you might want to try another one because your symptoms are so serious and taking meds that are not prescribed to you is never a good idea.
I know with opiate withdrawals I literally would not eat for a week. Nothing sounded good and nothing stayed down. Eventually I was able to eat some soup and some yogurt. Ginger Ale or 7-up also helped my stomach. It is important to at least stay hydrated and get some electrolytes in your system. Gatorade or even Pedialyte and just plain old water.
Hang in there! Take care and Good Luck!!!