Welcome to HCM
We understand your concerns
I went through your description. I suggest you not to worry much. From the description, I can only conclude that the symptom you are mentioning are not related with urination or pelvic problems. If it is due to some nerve
problem, it should be always there, not only while urination. If it is due to muscle, same condition. Nothing related to urology. Try ignoring the problem for a few days and it just vanish. We all have some weird feelings in our body like some twitching, pulsating etc. Learn to ignore them for better open thinking.
Hope this answers your query. Available for further clarifications.
Good luck and Merry Christmas.