I would make sure to detox seems like you could be herxing from ampicillin.
For memory/cognitive dysfunction, trouble finding words, brain fog,
Buhner suggests in "Healing Lyme" : Ginkgo biloba, standardized mg 2X daily and/orCentella asiatica(gotu kola):500 mg 2X daiy or tincture 1/4 tsp 2X daily(may cause headaches) and/or Taurine:125 g 3X daily
he also mentions Kudzu root, 500-1000 mg 3X daily or 1/4 to 1/2 tsp tincture 3X daily.
I didnt see anything about balance issues.
Check all herbals for contradictions and side effects as I am not an medical expert.