Hello, Over The Past Year I Started Having A Issue.

Hello, over the past year I started having a issue. My penis would pull up inside my body every now and then when I was doing work out on the ranch or when it was very cold outside. But over the past 6 to 7 months my penis pretty much stays up inside my body and I have to keep pulling it out. I still get erect for sex and my length when I'm erect hasn't changed. The only other issue is that I have to pee like 8 or nine times a night and a lot during the day. I'm 41 years old take bloodpressure medication and a beta blocker and PTSD medication. I ask my medical doctor at the VA about the issue and he said he didn't know but I shouldn't worry about it. Well it's not a normal thing for my penis to do and honestly I don't like that it's happening. I can't find any info on this issue but read a lot of Internet post on medical sites that other men of all ages are having this issue but no one can pin point what the cause is or how to treat it. Any information would be great and thank you for your time.