I had undiagnosed Lyme for about 4 years. It was shit. Really really shit.
In the end I went private. 1 year of antibiotics sorted it. Then I developed gut dysbiosis as a result of the crazy amounts of ABX. That was shit too (pun intended). Back to ‘normal’ now, it has been a long journey though and there are no cast-iron guarantees of full recovery.
Anyway, get it treated properly and get it treated fast. The longer it’s left (even partially treated), the harder it is to get rid of.
ILADS treatment guidelines suggest 1 month of antibiotics for early Lyme. Perhaps show this very document to your GP if there are any questions…