I'm a 24 year old male and I've recently been experiencing problems with maintaining an erection while also noticing the head of my penis that I can see (I have a tight foreskin) being discolored. It's a kind of light grey color. I'm urinating more frequently but I'm experiencing no pain while doing so, however the last couple of time I ejaculated I've experienced a mild pain. I went to the doctor and he thinks its thrush because I'm on a course of antibiotics for tonsillitis at the moment but I'm experiencing no itching so I don't know. I have just recently started a new relationship and have had unprotected sex so I'm just overall confused at my problem. Could it be a psychological issue or something more serious? Any help would be appreciated! Thanks!