Constantly anxious and panicky

i never feel good anymore. i feel anxious/panicky/and sick all the time. i am convinced i have a heart condition and a brain toumer. i can barely eat ever and cant do every day stuff. i have phobias of going in places and being in certain situtions....i always have headaches/ left arm numbness/ burning in my back/ nasuea/ anxiety at all times/ crying out of no where/ feeling like im gonna die. i see a physc. tomorrow and i just want to finally feel better. what should i say or do? is it in my head or is it real? these symptoms started 8 mos. ago after a birth control shot. i just want to have a good sense of well being and feel normal...whats wrong with me?