I bled while urinating for 4 days now. I feel a burning sensation in the penis shaft when I urinate. I know it isn't a UTI or std. The bleeding has lessened, but still happens. What can I do to treat?

BLOOD IN THE URINE. Could have been a stone or urethritis. This needs to be worked up by a urologist however to rule out other more serious causes.
Sounds like. A virus bladder infection. That would result in a negative bacterial culture. Yes, virus bladder infection does occur.