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Seat Cushion Pillow for Office Chair - 100% Memory Foam Firm Coccyx Pad - Tailbone, Sciatica, Lower Back Pain Relief - Contoured Posture Corrector for Car, Wheelchair, Computer and Desk Chair [link]
This one has served me well for nearly 2 years now. 650 hours or so on it and I don’t know how I flew without it. Honestly any cushion is going to be great compared to none. I’d say don’t spend too much unless you’ve tried a cheap one already. Protip if you’ve never flown with a cushion...you wanna throw this on top of the cushion already in the aircraft, you gotta double up.
When I still had it (I got surgery) mine was really severe when I would drive and my long commute to school was always the worst. I used this and it helped a lot. I do have a larger car so if your car is small you will be pretty high up.
I unfortunately went through the same as you. I’m 22 and my pain came out of nowhere starting in July. I later found out it’s from a large herniated disc. No idea how it happened. It was so extreme and in my entire right leg which made it nearly impossible to walk. I definitely had days where I didn’t want to continue on with my life. I wouldn’t wish it on anyone. I’ve been through xrays, mri, 6 weeks PT, epidural shot (only lasted 4 weeks), and finally surgery. Xrays don’t show anything for sciatica really so definitely push for an MRI. My primary care doctor was absolutely no help for me and I was finally able to get one with an orthopedic doctor (who later gave me my surgery)
It sounds like you might have a herniated disc, or it could also possibly be pain from the piriformis muscle. If pain is stemming from your butt (no better word to use than literally your cheek), that could be another good guess.
To help with the pain I used these
Penetrex lotion (from amazon) or CBD oils
Medications were always very short term reliefs for me and stretches almost made my pain worse so I don’t really have suggestions for that.
If you have any questions please ask.
I’ve been using this one [link]
It’s pretty good.
I bought one from Amazon. https://www.amazon.com/gp/product/B07HD8B9SP/ref=ppx_yo_dt_b_asin_title_o00_s00?ie=UTF8&psc=1
Have you looked into a coccyx pillow? I bought this one on Amazon for work and it’s helped me. It’s not also lower back support so that maybe something missing for you.