Did you tell the ENT about the "physical issues which might contribute to tinnitus" that you have? Did you tell him about having a big, hard plug of ear wax removed earlier this year? Did you tell him that you've had sinus infections this year? Did you ask him if he felt any of these things might contribute to your tinnitus? If you did tell him, what was his response? Why didn't you ask the doctor for the name of the prescription, the type of medication it is, and its common side effects?
Also, no one should need a doctor to tell them to protect their ears if they're going to be exposed to loud noises. That's kind of like - no one should need to tell someone to wear foot protection if they're planning on walking on broken glass. That might be why he didn't think to mention it. He probably didn't think he should have to mention it.
Something could very well have triggered your tinnitus and hearing loss, but the fact is, you have it. It might get worse, it might not. It really depends on the nature of the damage. For instance - for me, there is nothing I can do that will prevent it from getting worse. My problem is degenerative, and I've had it since I was born. Nothing triggered it. I DO know, that wearing my hearing aids tends to relieve the tinnitus for a temporary period, even after I take them out again.
Tinnitus is very common for people who have hearing loss. It's nothing to get suspicious about, it's not usually a dubious situation at all. It's just annoying. Unless, like me, it's so pervasive that you're used to it and rarely even notice it anymore. I didn't notice it today, until I started reading your post! That's HOW used to it I am