two weeks ago I woke up with an erection like always my penis curved a bit to the left and I would enjoy grabbing it and curving it the opposite direction a bit, well this morning I did this and I heard a pop, it did not hurt, my erection went away I jumped out of bed noticed it was changing color. went to hospital er right away, Dr told me that I busted a vein and to see if I get a hard on that night in my sleep, I did. two weeks later the bruising is going away and my erections hurt and seem smaller and there seems to be a knot where it busted is this true? and will it go back to normal state like it was before? what is that knot on the side?