Opinions On What Could Be Wrong?

im 21 male for a few months my heart rate has been flucating alot sometimes its 75-85 other times its in the 90s sometimes maybe even a little over 100 its at its fastest when i wake up in the morning and i wake up sweating even with the air on..for about 6 weeks ive been having chest pains there on and off all day most of the time more on then off and the pain is also in my rib area the pains dont happen together my chest and ribs are only tender to touch sometimes not often,,ive been to the er,dr,cardioligst..they have done alot of blood work on me,chest xray,several ekgs,echocardiogram,and 24 hour holter monitor, and all that stuff seems to be fine..theres no triggers to cause the pain it just happens i did notice after i get up im not in alot of pain the pain really starts kicking in 1-3 hours after im up and walking and sitting around mostly sitting,it happens when im sitting standing or laying down