Agonising Pain! 😭

I've have hypermobility which has caused the SPD/PGP during pregnancy.

I've been to physio, it's been rough but I'm been able to deal with it quite easily.

A few days ago something popped on the right side of my lower back and I've been in agonising pain since!

There's no specific place, just feels like it's all over on the right side (back/hip/butt).

I've throw up a few times because of the pain.

If I stretch my right arm out and lift something that also sets the agonising pain in my lower back. Do I need to go to A&E, Midwife, Doctor, Triage, physiotherapist?

(I'm from the UK so solutions might be different.)