hi
i suffered real bad from about 20 weeks in my first pregnancy.
I would whole heartedly agree with the silky nightie and sheets, i did this also ( although make sure dh/dp knows why you have invested in them, i know mine got a glint in his eye when he saw them!)
i paid a weekly visit to an osteopath, and while it didnt cure it, i am sure it really stopped it from getting worse as e worked on re alignment and strengthening the muscles around the pelvic bone area.
If you can bear it, try lying on your back with knees bent, place your hands just under your hips and slightly in a bit and press lightly but firmly, then contract the deep tummy muscles. You should feel it tighten under your fingers, hold for a count of five then relax. Repeat as often as possible. Its a great, easy , safe exercise to do when you are pregnant, and one i found to be really easy.
Another tip, if you have to drive anywhere ( bit like the silky sheet idea) sit on a plastic bag, this aids you when you get in and out. Keep your knees together and swivvel on it. might look a bit strange but helped me.
A wheat bag, heated and placed on your pelvic bone when your sitting gives a bit of relief ( or hotwater bottle i guess) and one thing i found, was not to sit for too long as it seemed to 'set' and i found it harder to get mobile.
i wore my belt at night time, under the nightie, this helped me when i had to keep getting up for the loo in the night and as i always found it bad in the morning after lying for a long while, it supported me while i regained my mobility.
I asked fro crutches and my hospital were only too happy to give me some, it might be difficult with you 2 yr old, but even using one for some support is better than nothing.
I am on my second pregnancy now, and unfortunatly my SPD has increased dramaticly ( i am only 18 weeks) I am definately going to give the acupuncture a go this time round, i have also heard it helps...
Try not to feel too down about it, it does get better in time, and it wont last forever, its an awful thing and becasue noone can 'see' it you dont get the sympathy you deserve hope you can take some of the tips we have given, keep your chin up, think of the beautiful baby at the end of it!!