Hello Doctors. 3 weeks ago, when i stood up from a bench, i felt severe contraction of penis i.e. penis is contracted inward. It lasts for a minute. after 2,3 days, i again had a feeling of penis contraction and my testicles were moving up and down very frequently. I took 10 days antibiotic course from a doctor, but still since 7,8 days, I am feeling a sensation of spider crawling inside of my scrotum and testicles. Mostly, when i sit it immediately starts. this sensation comes and goes after every 5 minutes on average..please guide me.