Should I see a urologist?

I agree with your analogy with your exposure to plastic and while I have no alternatives that you could potentially do, I don't think your reproductive system has been scarred by your exposure to the burning plastic. Of course, constant worry or even the paranoia of potentially having issues can be tiring and wear on a person's immune system and mental state of mind just like other stresses can and many be larger and more stressful since it's a sensitive and vital part of the body that people really want to be usable. Why not schedule an appointment with your Urologist and have tests done. Just explain the situation to him and see what he says. He'll be happy to run tests/examinations to see if you're fine to put your mind at ease. That is what he's there for. Talk to him about alternatives to burning plastic to get away from stress. I'm sure he can recommend some things or someone to talk to about it. Don't be embarrassed to see/talk to him/her as that is what they are there for. Hope this helps.