How To Deal With Anxiety Related To Penis Problem?

Question : I am asking a question for my son who will turn 18 next week. A year ago, he stuck some type of worm inside his penis hole and then pulled the worm out. I was unaware of this, as he started to complain of weird feelings in his testicles. I assumed it may be hernia, and we went to our internist. He had an ultrasound of the area to check for hernia and it was normal. He kept insisting that he may have a parasite and we had many test run including EKG, echo of heart, blood work and stool test for parasite's. All tests were normal. He finally let me know later what he had done and the reason why he was concerned about parasites. A year later, he says he still feels strange movement around and above penis/testicles. He also complains about eye floaters, but had a normal eye exam a few months back. He is very concerned that a worm could be living in his body. Since the incident, he has had trouble with having an erection. Is his concern a possibility? Even when he pulled out worm, could part of it have remained in body? Our internist is a member of our family, so he is embarrassed to tell him. Thank you!

Thank you. Is Albendazole an over the counter medication? Where would I get this?