It's honestly not that bad. It's just uncomfortable. It take less than 10 minutes (I was there less than 5 I think) You will get those weird cramps when they do it just like you did when you had your biopsy and mine lasted a bit but Tylenol did the trick.
I didn't bleed right away. I had it done early in the morning and the bleeding started just before bed, it was heavy and lasted a couple hours and that was it. I had a thin brown discharge for a couple weeks.
I got myself sooooo wound up just like I bet you are and pretty much had a panic attack before going it.
I don't think I would go under if I were you. When you wake up you'll feel groggy and gross for a couple of days and that will only be from the anesthetic. It'll just be more grief.
I do get exactly how you are feeling and when I was about to go for my LEEP I was upset that going under wasn't an option for me but I'm glad I didn't ask for it cause it wasn't that bad.