Problem With Getting An Erection

Patient: Ok i am 30 yrs of age i do have diabeties, i have a problem with having a full and hard erection and also cumming i do go through the sensation but when i cum nothing comes out even if i squeeze or if its at the hardest point it can be nothing comes out. i use to cum normally, then this happen then i didnt cum and yrs pass n now ozzze out cum after wards i have taken viagra cialius, and nothing, no hard on nothing i took like tic tac nothing! i finally after years saw a urolo dr. he said i was ok after some blood work?? but if i was ok dude to his test why can’t i get a hard on!?im depesrate for help, for this has ruined my life please help!