"I fell some sort of vacuum, or odd feeling especially on the penis itself….kinda like an odd sensation that makes me feel very uncomfortable. Anyone experience this feeling?"

I had the same feeling anytime I moved the large bag or emptied the leg bag. I really didn't get an answer on it from the dr's they basically told me not to worry about it because the foley was temporary / post surgery.

Sorry I don't have any more information for you, just that I recall the same issue.

I told the nurse about it in the hospital the after surgery, her response was that what I was suggesting wasn't possible. So, I guess I'm nuts. ¯\_(ツ)_/¯