Hi there.
I had a blighted ovum diagnosed ~9 weeks, and I wanted to avoid a D&C too. I waited more than 3 weeks before I totally broke down and called to request the procedure. ~12 weeks, I had it done.
The D&C was SO much easier than the waiting. Sure, I cramped. Sure, I had to miss a few days of work and I had to have my family come to help with my daughter for my recovery, but it was really no big deal, and it gave me the closure I needed to heal and move on emotionally.
So here's how it went for me:
I had an early appointment. My daughter spent the night at my parents' so that my husband could take me to the hospital 1st thing. They do the procedure in L&D, so be prepared for that, but the nurse rushed me into my own room so that I wouldn't have to see or hear any other women giving birth. The nurses were so kind to me. I filled out a whole bunch of paperwork, then the anesthesiologist came in to put me under.
I was really, really nervous, but they put me out, and when I woke up, I was chatting away happily giving the anesthesiologist lots of unsolicited advice on how to get her child to sleep through the night. The most physically painful part of the entire morning was just them placing the IV. No big thing at all.
For the rest of the day, I couldn't lift anything (like my daughter), and I just had to rest. I had something like a heavy period for a couple of weeks with cramping for several days. The meds they gave me helped a lot (tylenol with codine). I only had to take one pill. The rest of the time I just took ibpruofin. Crampy, yes, but not unbearable.
It took another month or so for my HCG to drop to zero, and when it did, I got my period. I'm now on my second period, and there's no reason to believe I won't be able to get pregnant again. We'll start trying soon.
I know it's scary. I felt the same way you did. I wanted to avoid a D&C at all costs, yet the waiting completely broke me. I was so depressed I could barely drag myself out of bed and I missed a lot of work. It was crippling. After the D&C, all that weight was lifted off of me. I was still sad, but I was SO relieved.
I know so many women who have had D&C, and even though there is a small risk of complications, all of the women I know who had it were able to get pregnant again no problem. This is a very common procedure, and it almost always goes well. I'm sure that it will for you!
You're so brave! I wish I could hold your hand through this, but if you need more words of support or if you have any other questions, I'm here.
Love and strength to you. It is going to be okay.