Hi Cajungrl,
This is very firghtening, Its is best to get a thryoid workup, I had tryoid issues after my lyme disease resolved, I elso get this feeling when by blood pressure goes up, I starte a B Comples vitamin and it caused the feeling you described as soon as I stopped it it was gone, but the biggest issue is the thryroid, I was on thyroid meds for approx 16 years on almost the same dose till I got lyme and since than constantly adjusting dosage, Ticker can better explain it but some people do better when their number are on the lower end, feel better