I saw a PT and I got another fit on my bike. My saddle was 7mm too low and 5mm too far forward.
I cannot possibly ride 3 hrs and then see a doctor within an hour, so this isn't something that a doctor is going to pinpoint- it's a cycling issue that a cyclist should be able to solve, which is why I just ordered a copy of "bicycling medicine."
My saddle is an S-Works Toupe. It is flat and hard, but I've ridden it for years.
Mostly likely my position was constricting the lymph or bloodflow from that area b/c immediately after raising my saddle and moving it 5mm back my sensation of pressure on my pubic area was less noticeable.