Yes, something like that has happened to me. My last extraction took more than 2 hours - the tooth crumbled mid extraction, but after more numbing injections, my dentist persevered and finally, every bit of the tooth was removed. I had a lot of bleeding after that, but with ice packs etc and rest, i was fine. TBH, I had a dentist phobia anyway, but now, I dread going. As a matter of fact, I haven't been since lockdown.. Please get this tooth removed. Don't be afraid, it needs to come out. Since you are going to Hospital for the procedure, you may have a general anaesthetic, but whatever it is, that tooth needs to come. Due to medication, I have lost a few teeth, but I'd rather that, than have a 'disintegrating tooth in my mouth. Good luck for Wednesday - you'll be fine ...