First off.... B12. Low B12 leads to weakness etc and other neuro symptoms. Your test should be 400-500 or above to be normal.

I would also get tested for heavy metals. Arsenic, mercury, cadmium etc.

Did you have vaccines recently? Autoimmune markers?

Being a vet, could you have contracted some virus?
Have you had viral titres for Herpes family?

GBS causes numbness, and you might have a slow variant.
This can come from vaccines, or some infections. Campylobacter is a known cause (from poorly cooked chicken).
Trichinosis?

I have to say, my cat sneezed on me last year at this time, and I got a nasty virus from HER! Never mind the human viruses!

I'd sure go thru all the diseases of animals you are exposed to, first.

I would also get better Lyme testing. Go to the top! Western blot has false negatives.

Do you use statins? Have you had fluroquinolone antibiotics recently?
Both of these damage nerves.