I understand your concerns.
Bleeding can be triggered by alcohol itself it is also a blood thinner.
Aspirin, ibuprofen or any other blood thinner can cause this commonly.
Kidney stone passing can cause profuse bleeding and then subsides shortly. This may not be noticed by initial blood clots and then clearing out with fluids make it more likely.
Your PSA level does not really suggest prostate cancer.
And normal kidney function tests rule out any kidney problem as well.
Given that your symptoms disappeared any other possibility is very unlikely.
Any recurrence of similar episode in future should warrant you to get a cystoscopy to rule out any precancerous bladder lesions.
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