I think delayed onset of pain is possible. I'm not the best source of info on that. For me, following an unexpected loud noise that startles me, like one of my kids that lets out a shriek, it just ramps up my tinnitus and can make it more vicious. But it's pretty much immediate.
For the weird feeling in your ear I can't tell since you can't describe it. Even if you could, chances are I don't know. My right ear feels weird , like there's a void in information coming in, maybe because of the asymmetry between my two ears in terms of hearing loss?
All the best Pete.