Just FYI:

Test for Lyme Disease often goes wrong. Lyme Disease is very difficult to "catch" so the best thing is a test from many different parts of the body to different labs and if you suspect it, then test again a few times.

If you came out positive could mean you have a strain in you. After 20 years there is a possibility it is quite a strong strain. Thought it is a bit strange it should have crippled your nervous system by now.