Fear of Allergic Reactions/Anaphylaxis

Hi...I have Generalized Anxiety Disorder, Health Anxiety and Panic attacks. My skin is ALWAYS so itchy too and inside my throat an ears as well as tight throat constantly. I am suffering from a horrible fear of medication and allergic reactions to medication where my throat closes up/ ANYTIME i attempt to take meds, my throat feels like it spasms and closes and i get itchy everywhere even on my meds i take daily ill even get dizzy short of breath Etc. I start CBT therapy on April 5th, but this fear is ruining my life I even get nervous with foods ill feel itchy and immediately think im gonna have anaphylaxis. Even on my meds i take daily like omeprazole i feel like im gonna have a reaction to them and get nervous and sometimes dont tke them. My sister had a horrible reaction an antibitoic which caused her anaphylaxis and i dealt with this by myself when my mom was out of town her throat almost closed up. Im having horrible anxiety thinking this is gonna happen to me EVERYDAY. HOW can i get rid of this fear? Does anyone else have this fear---- Its driving me crazy as I couldnt even take tamiflu for the flu as I had a fear of my throat closing up from an allergic reaction...i also stopped eating seafood cause im scared ill have this reaction.