Combined pill and lower back pain

Ive been on rigivedon for about 21 days now my first packet so still quite early on. However I’ve been experiencing lower back ache which has been going on and off for a while and it is getting me down I have booked a GP appointment incase it’s something more serious or to change pill. I can see 1 in 3 women experience back ache on this pill so I am quite sure it’s this.i think I have also felt quite down within myself and my gums have been more tender and sensitive.

I started Microgynon30 becase my previous mini-pill (Cerelle) made me bleed every other week. Pharmacist advised the combined would regulate the periods. Unfortunately within 24h of starting Microgynon30 I have severely painful breasts, swollen and itchy (I went up a full cup size and it's not fun, I can't fit into my bras and running has become impossible). Nipples are itchy and sensitive and get scabby and dry. I have sore muscles as if I was constantly PMSing. The worst side effect though has been migraines with aura. Never had migraines in my life before, and now I do. I'm gonna switch to Slynd now, I don't ever wanna go back on a combined pill ever again.

Generally my mood on it was brilliant however it caused severe bloating and cravings so I gained weight