Good afternoon, I am a 58year old Black male. I had heart bypass surgery and is a 10+ year Type2 diabetic. I am taking a number of medications (Jamumet, Ranexz, metopolol (25m), jandiance, Lipator metanex and novolog 70/30 (22units 2x day with ANC of 6.9). I have taken Calis, Viagra, and now Sildenafil(20mg) with instructions to not exceed 5 at one time. I get a medium erection with little extension. My errection is very short and can loose it while foreplay. Seems as if my desire goes as my errection. Is there any of these medicions fighting with each other or causing my issue?