iPhone in loop and won't turn on after dropping in bathtub

I think it's a 7 or 7+ idk...Stupid old me dropped my phone in the bathtub while trying to listen to some answer a phone call! It seemed fine initially, just looked like it had a bit of water damage with the screen but nothing a bit of drying couldn't fix. I took off the otter box case right away and towel dried it first, and I tested if all the gears and whistles worked and everything worked just fine except it was stuck in headphones mode. No problem, just restart it, right? Wrong! I go to do that and then it went in a continuous loop of apple logo then black screen for about an hour while I tried to restart it. I tried to connect it to my computer and iTunes didn't recognize it. It turned back on for a hot second and showed it was charging before going back into that stupid loop again. I put it in DFU mode but again iTunes didn't recognize my phone and so I just tried restarting it and back to the loop, before it completely went off and nothing's going on with the screen now. I also dried it with a hair dryer and it's dry as a bone now and plugged into my wall. I don't know what to do! I have a busy af week and literally can't function professionally without a phone for this week of all weeks!