Anxiety over everything! !

I have had anxiety for years !! Probably for about 14 years out of my 29 years of life so almost half of my life off and on! It all started when i was 15 and my ex got me to try crystal meth and i got really paranoid and i had to go to the er and be sedated i was freaking out so bad and its been on and off since then! I have never done any more hard drugs after that ... i smoke pot now... this time around it started maybe 3 months ago and it's gotten progressively worse.. last time in 2014 when I had it I was so scared I thought I was dying everyday from some sort of medical issue ... I had numerous ekgs stress tests ecgs ect and I was fine nothing was wrong! I hate it so much but I just don't know what to do! All of my anxiety is about my health. Now I'm barely able to eat because I'm scared I have unknown food allergies as soon as I take a bite I get sweaty my throat feels like it's closing but I have never stopped breathing.. in 2014 I even had an allergy test because I had this same problem and the only thing it said I was allergic to was barley and they said a moderate allergy was detected... this is ruining my life it seems if it's not one thing I'm having anxiety about its another ... went from heart attack and seizure stroke anxiety (mind u I have never had either ) to food allergies and fear of anaphylactic shock (which I never had either) My quality of life sucks I'm not happy anymore I am prescribed celexa and xanax but I've never even taken them because I'm scared of having an allergic reaction I don't even take ibuprofen anymore because I took one while shopping with my mom and I had a full blown panic attack thinking my throat was closing ...my family doesn't understand and says I'm dramatic and crazy I'm so lost I just want to get better... has anyone else been through this?? Has it went away ? What should I do? Please!!! advice !