Hello, I'm 38 weeks at the moment and what you have described was exactly how my SPD started. If I can give you any advice, it's try not to do too much and rest rest rest. Waddling and losing the ability to walk properly is exactly as I would have described this when it started with me, and tbh my midwfie told me the pains/achiness/stiffness I was feeling in the pubic area were normal. I now know that this is incorrect, and due to that advice I still tried to go about my daily business as if nothing was wrong - big mistake.
See if your Dr can get you to a physio ASAP and they may be able to help you with some exercises and maybe an assessment of your pelvis. I ended up getting a support belt and crutches, BUT in all honesty the only thing that has helped me is doing nothing. I had to be signed off work since around 26weeks.
At first I thought it was better to do some walking as I felt so stiff and it did start to ease off after a few steps, however as time has gone on and in my case I feel that doing this has made me worse.
My physio said there was nothing that could be done until the birth and advised me to
- keep knees together
- do lots of pelvic floor ex
- Suck tummy muscles in before getting up/moving
- rest
- Have pillow between legs and lay on side in bed
I ended up seeing a chiropractor who assessed me and advised that my pelvis was out of alignment and that the support belt was probably contributing to letting my pubic bones at the front overlap and this is where the discomfort was occuring. He has been adjusting me and this has been the best source of comfort to remove a lot of the pain but I believe it may not resolve until after birth, however many women do seem to have issues after aswell. So I guess it's a wait and see and in the meantime go easy on yourself.
I also found that I cannot lay on my side as this is when my bones start to click in and out. not the best. I am certainly not as bad as some women on here, but I am at the stage now where a wheelchair would be great to let me get to the shops. My OH has been doing many many things for me, and it's hard to accept - but if it has to be this way then that's the way it has to be.
Here are some links, I am sure others will come along and contribute more for you:
www.pelvicinstability.org.uk/
www.laurelalexander.co.uk/membersarticles/articlespd.php
www.plus-size-pregnancy.org/pubicpain.htm
And one long running helpful thread on here:
mumsnet.com/Talk/pregnancy/844155-SPD-Sofa-support-and-advice-offered-at-no-extra-charge
Best of Luck xx