I'm a little curious. You say you are getting priapisms, but those are erections that are not only painful but last for over 4 hours. What it sounds like to me is you're waking up with erections you don't want. If they go away when you urinate, they aren't priapisms. They are unwanted spontaneous erections, which are quite common. There's a lot of different reasons to get them. I would be concerned if they are painful, don't get me wrong, but again, the dangerous priapisms last a really long time and again, you sound like you're just getting normal nocturnal erections. The pain I don't get, though, so I'm not saying don't be concerned, just that you might be concerned about the wrong thing.
My first thought is, yes, please see a Urologist - this type of issue is right in their wheelhouse.
Question: Are you by any chance African-American? Black men are prone to sickle cell disease, which can cause priapism. I believe in rare cases, White men can have this condition, so this may need to be investigated either way. Normally race wdn’t enter into these kinds of issues, but in this case, there’s a slight possibility it could.
Other than that, I don’t know what to tell you as far as the reason this is happening, but one thing is for sure: you need to get to the bottom of this issue. Priapism is no laughing matter, not only is it painful, but repeated episodes could do damage to the Corpora Cavernosa - the 2 chambers (one on each side of the penis) which fill with blood to create an erection. If these chambers are damaged significantly, it could result in severe ED that might not be reversible, so please don’t delay - get this checked out w/ a Urologist ASAP.
Also, please check back in here & let us know what’s found - that info could help some w/ the same condition…
I forgot to mention I'm a 26yr old virgin so no STDs.