First, I am a 25 year old male, in great health.
I was masturbating and I vomited, and this was the first time it happened. I felt fine before, and the nausea persisted for a bit after. Now every time I masturbate, i fell like I am going to vomit; but have yet to vomit again. It is starting to worry me a bit, cause I sometimes have trouble urinating. Its kinda like I get 'stage fright' and unable to start the flow. After 'pushing' for about 45 seconds, it usually starts.