Heat pack? I often strap a small hot waterbottle to my back with a scarf for walking to school (3 miles) but that would probably be a bit cumbersome for work/commute so perhaps those self heating patches?
Bump support belt? I haven't used one myself so not sure how good they are. Physio would help, but NHS physio has a fairly long wait which wouldn't be any good to you at 32 weeks - I was referred at 30 weeks for sciatica, and still haven't heard anything at 36 weeks. I would have gone privately if it hadn't improved a bit though - it costs about £30-40 for a private physio session. Even just one session might benefit you though as they would be able to teach you the right exercises to do. Fit Flops might help or at least comfy flats which provide some support as they do help improve your posture. Hope you feel better soon x
Just remembered that someone gave me a bump support belt so will dig that out! Will also look into physio. You're right - probably too late for NHS but might be able to afford a session or 2 privately xx