Bleeding from penis won't stop.

I have a british bulldog who began bleeding from his penis a week ago. Took him to the doctor and found out he might have a nick somewhere on the inside of the tip of his penis, added to that, he got a tick bite somewhere else that lowered his platelette count and so the bleeding was taking forever to stop. After trying anything and everything…the doc recently castrated him…to prevent rushes of testosterone and blood ruching to his penis…which sprays out when he has an erection. They found some slush in his bladder which they said was cystitis from the tick bite…and it seems to have cleared out. During the surgery…they also inverted his penis and ut some sort of powder in there to speed up the healing. His platelettes are back up…but he still bleeds everytime he gets excited or sees someone new….also in the morning when he wakes up….its been one day since the castration…and about 7 days since the bleeding started. But nothing seems to work…Im not sure how a dog can cut himself in such a place….and am worried that there has been to much blood loss. Please help!