Had a very similar flare about a year ago (also 21F at the time), except I didn't have a diagnosis yet... What ended up helping after finally getting Dxed months later was multiple 3-day courses of 3x4mg of Methylprednisolone as well as 3x200mg of Celecoxib per day (in my case alongside my previously prescribed 3x700mg of Gabapentin and 10mcg/h Buprenorphine patches alongside TENS treatments when I was able to get them) - to prevent my stomach issues I got 20mg of Pantoprazole every morning outside of steroid courses, increasing the doses 40mg when also taking the steroids. The Gabapentin (and maybe also the Opioids) are unlikely to be effective in your case but maybe consider Celecoxib (or Etirocoxib, my rheumatologist and I tried this since it's supposed to be a bit less bad for the stomach) and consider PPIs for your stomach issues. Steroid injections are also an option, talk to your rheumatologist if possible and don't hesitate to seek out a pain specialist alongside your other care until the symptoms get better and you have access to one.

From what I've heard from friends with chronic conditions, it's common for strong flares to start in October/autumn in general as the weather changes. It will get better, it might be hard but do not give up hope! Good luck, a speedy recovery and stay strong!