Please please help!

hi everyone.

I have just moved back home after 3 years living away, and while redefining my eating habits my family doesn't understand my sensitivity to food and why I need to eat a certain way, making sure my meals are planned, and prepared for the week. Am I being unreasonable if I ask them to not eat my food? (I don't work, so have very little income and in debt, so when I purchase food I need to be healthy it really is an investment for me). I cannot eat the food they buy because I am allergic to wheat and diary and they do not eat much meat. Meat here is very expensive.

I'm being accused of creating disunity in the family, being selfish and being cursed with "You'll never be able to live with anyone, ever!"

What do I do? Surely I am normal? Am I asking for too much? Does anyone else have anything similar happen in their life? How do you get around it? Pls, I'm desperate to talk to someone about this as I don't know where else to turn.. My family is fighting with me and making me feel really low. I'm worried I'll get depressed again and considering moving out - what caused me to leave in the first place. I don't know what to do and terribly unhappy ...

Please help! :s2(

P.s. I am on step 3.