For around 6 months I’ve had a floating lump (about half the size of a pea) next to my right testicle. I went to the GP around 3 months ago and was told to keep an eye on it and that it would probably be fine, I didn’t feel any better after hearing that. 

Yesterday after standing up from watching a film I felt a horrible pain in the same area as if I’d pulled a muscle in my testicle. The pain went away overnight but I’ve had a nagging feeling about it ever since  

should I be worried?