Make sure that you have all the checks for B12 deficency and magnesium; indeed any problems of too little or too much vit b may cause a problem.
I would also suggest going to a larger university like Vanderbilt that has a history with covid and covid vaccines ad has a long covid unit.
I had a reaction to the vaccine which was proven by testing at Vandy.

Also something that I used but it took time was a supplement called SPM, prescribed by my neurologist. SPM is what your body makes from omega 3, but something that we make less of after an infection and with age.
Seems Covid is believed to be a low level inflammation problem for at least some people, and SPM is what our body makes to resolve low level inflammation.

Here is an AI google listing of how SPM supplementation might help:
question: How Might SPM Supplementation Help?
Unlike traditional anti-inflammatories (like Prednisone or Ibuprofen) that simply "block" the immune response, SPMs are designed to actively "resolve" or "finish" the inflammatory cycle.
1. "Stop Signals": SPMs act as biological "stop signals" that tell your immune system to shift from "attack mode" to "repair mode".
2. Cellular Cleanup: They activate "cleanup crew" cells (macrophages) to remove the cellular debris and "byproducts" of the initial COVID infection and subsequent vaccinations.
3. Nerve Protection: Some studies suggest SPMs like Protectin D1 (PD1) can protect nerve cells from further damage and may help alleviate neurological symptoms like brain fog.

Copilot did suggest taking a baby aspirin with the SPM dose to up the effect for me. Best to check with your doctor, especially about the baby aspirin, but also about the SPM.

I still take the SPM daily for my vaccine induced neuritis. It is much better and continues to improve. Here is the product which I take and which my neurologist recommended. It is available on Amazon and from Metagenics:
metagenics.com/en-us/product/spm-active