The other day about one hour after a 11mile fast cycle ride I drove my car to hardware store but when I got out of car I felt awful not dizzy but more very uneasy made me very scared! Went to docs next day she said I needed to eat and drink more before exercising ( also on diet chef diet ) over next few days I'm getting heart palpitations and awful stabbing pain about 6 inches under left armpit, also getting chronic trapped wind after eating and I feel myself getting proper worked up about it! Does anyone experience this at all? Should I visit doctors yet again ? I'm just lost and worried sick about going out anywhere in case I collapse. Please give me some advice.