4 stents later and still have shortness of breath

Has anyone had shortness of breath and some chest pressure, 99% of the time upon exertion, EVEN AFTER, having 4 cardiac stents in the LAD artery? I have met with 3 pulmonary specialist who advised my lungs are fine and it's not my lungs. I have had 4 catheritizations in less than 2 years, 2 of which they inserted 2 stents each time and 1 of which caused a femoral artery dissection (right groin) and 1 which was last August (in arm which spasms), said no need for any other stents at this time. 4 cardiologists later, I'm at a loss! I'm frustrated, fatigued, gaining weight, losing my hair and very frustrated. Are there any other tests that can be done that are not invasive? recent stress tests (nuclear and exercise) seem to be considered normal. Echo shows only mitral valve moderate regurgitation and mild tricuspid regurgitation. Cardiologists said he will do another angio "If I want". If I want? Not sure what to do! Still on plavix, aspirin, metropolol, imdur, losartan, repatha.