There indeed would be many areas where your upper teeth roots would leave a voided out area once the extractions have been done. That makes sense. The good news is in 6 weeks or so that entire area will look quite smoothed out and gums will have healed as well, and all will look normal & healed.
I am so sorry about the pain! I do hope your Dentist prescribed a pain medication. This would be temporary, to get you through the first wee or two of pain, as needed. So, when/if you run low on such, do call your Dentist for a refill. And sadly, the pain process is real. Unfortunately it's a Mother nature thing that none of us can control. Hence the pain medication need. Just don't take too much of them - OK?
Bleeding, somewhat anyways, at this stage of things is not unusual. It is undesirable, but does happen. The bleeding from day to day however should be improving! It's slow, sorry. But please DO hang in ther, as it should subside and certainly will do so with time...
It sounds like you got an Immediate Denture. And, in about 8 weeks, it will be needing a reline to fit better, once you've both healed, but also are feeling better!
Again, I'm so sorry about your pain. It's tough to hear "hang in there" and take pain meds as needed. But, in truth, that is about all one can do. So, please do try to endure. The very best news I can give you is: This too will pass, I promise!
I hope you get better, and quickly.
*PS: If you should have any further concerns/questions, please do not hesitate to ask - OK?