Fear of bering allergic to stuff...?

Back in august i got chronic hives for no reason. My doctor did some allergy tests and he cant find anything im allergic to. I also have a horrendous panic attack disorder. with the hives and facial sweeling, everytime my face swells i freak out and think im gonna stop breathing. Im scared to death of the hives. Im also afraid to eat ANYTHING. no matter what i eat i always get a funny feeling in my mouth like a tingling or itching. and its ALL stuff i eat all the time. Ive never been allergic to anything and now im afraid of everything i eat or touch. I also have a problem with thinking my tongue is always swollen. it will feel like there is a hive on it but it wont look like it. and when i try to sleep i wake up 5-10 times a night freaking out because my tongue feels swollen. Im on prednisone and benadryl but im afraid that wont be enough if my throat decides to close. has anyone else ever gone through this? Is my mind making the symtoms worse? I always feel like i cant breathe and im always freaking out. This is SEVERLY ruining my life. I havent slept in 4 days, i havent eaten in 3. Im scared and i dont know what to do =/ Someone please help me? even if its just support or someone for me to talk to when i get scared. thanks guys