Glad it's all resolved, Moomin! :)
Your night time crawl sounds awful, ClearlyMoo. :( Can you go back to the doctors and see if there's anything else they can do to try and ease things a little?
I'm starting to get more pelvic pain here, if I sit still for more than thirty minutes then I hobble for the next hour. Probably doesn't help that I was crawling around on the floor at the weekend shortening some curtains for the nursery, admittedly. Sitting at a desk all day isn't helping, nor is the fact that I have to walk a couple of miles each day (not all at once) as part of my commute.
I guess I'll mention it to the MW when I see her next Monday. (First time this year, only my third appointment. I'm clearly less interesting as a second timer. 
) I suspect I'll be told to live with it, however.
For those who asked about bedding...
I tend to run with four sets of fitted sheets and four mattress protectors, the sort with an absorbent towelling side. Having four sets means you can have one or two in the wash at any given time and still be able to make up the bed with a backup set. They tend to sell the things in packs of two, anyway.
When making the bed, put two or three alternating layers of protector/sheet. Then, at 2am when your LO has made a mess, it's easy just to whip off the top layer and find a new one ready underneath. :) Then you shove the mucky layer in a basket and deal with it at a more sociable hour-!
You'll need some blankets for initial use, as I don't think newborns are meant to use sleeping bags. There's a minimum weight for those, but I think DD1 reached it within a few weeks so it's not too long to wait. (Just as well - sleeping bags are awesome!) I used a cotton blanket initially, but that was just personal preference.
When DD1 moved into sleeping bags, I had three in each size. One to use, one to wash and one to have in reserve. There are heavy weight ones for winter and single tog for summer, but you could use a summer one with a blanket during colder months to save some money.
If you have access to a tumble drier, make sure you choose ones that can be tumble dried! It's a life saver when your LO has a tummy bug and is throwing up every few hours.
I found that front zips were easier than size zips and ones that could be unzipped from top or bottom were great for stealth nappy changes at night. It's an awesome feeling of smugness when you manage to sneak in and change your LO's nappy without waking them! I managed once.
Also, personal preference but I had a couple of these and found them useful. They're safe to use from birth. DD1 always seemed happier with her head and neck supported, otherwise her head lolled to the side which looked uncomfortable. She also didn't develop any flat spots, which may or may not be related.