Hiya, I suffer with my back anyway as i have a curved spine but it is agony now i'm pregnant, i have days when i can't believe how bad it is. I also have SPD which is equally painfull. I'm quite lucky as my doctor has been fantastic and had me at physio and on co codamol (i stopped taking these when i got my BFP but he put me straight back on them as they have no proven risks for baby and pros for me outweigh the slight ones anyway, although i do try to avoid taking them where possible) from quite early on. My friend who is due 5 weeks before me however had to really fight to be taken seriously by her doctor and mw and has only just been diagnosed with SPD and given painkillers etc.
Nothing takes the pain away but some things help, just the usual hot water bottles, paracetamol if thats all you can take, warm baths (although its difficult getting in and out of them) and rest where possible. If i were you i'd mention to mw or go back to dr, there are ways they can help you and its not fair to leave you in this amount of pain sweetie. I really hope you find something to make you feel better soon x x x