So recently, last couple of months or so, I have some minor to medium physical pain, either a localised headache or a weird stomach ache, or irregular heartbeat or just out of nowhere I am convinced that I have some terminal disease, heartattack, intestinal cancer, brain hemorrhage etc. whereupon I get a panic attack for a couple of minutes to half an hour, dizzy and irrational thoughts. I lie down and try to breath and play some rhcp, which helps a little. 

Just now I ate an apple, then sat down to smoke a cig, felt something weird in my throat and the cycle began anew. I've since calmed down, realized it was an apple skin stuck in my throat... how embarrassing. 

It also happens when I think about some bad (but not so horrible) life choices I made, although less frequently. Is this anxiety? Is this something else? Anybody have any advice or experience with something similar?