Man I am so sorry! I hope you are recovering well. It is so upsetting they didn't listen to you!
I had a surgery 10 months ago with a similar set of "how is this all happening to me"...it was a long surgery and I was in great health so it went ok, but I started bleeding. So it took alot longer (8.5 hours). Then I was doing "fine" for a week, then bleeding internally (my blood count was half what it should have been), infection inside the giant hematoma which my doc never saw before, fluid collection, second and third surgery, blood transfusion, and lots more weeks recovering. I lost my muscle mass...I say I ate it because I was unable to eat for weeks. I am still getting back to where I was before fitness wise.
Looking back, I think I failed to really advocate for myself. I was so afraid of seeming crazy that I never pushed how worried I was. If I had, all of it would have happened but I wouldn't have been in quite as much agony. Lessens I guess.
I really hope you are on the road to recovery!