Sorry to hear that your husband has Lyme's. Hopefully they have caught it soon enough and the treatment he is receiving will clear it up.
I had Lyme's disease a long time ago. I was bitten on my back and when my mom pulled the tick she noticed that there was a ring. We kept an eye on it and as soon as I felt flu like symptoms they took me to the doctor. They started treatment with an antibiotic and I recovered without lingering effects.
I hope that this will be the same scenario with your husband. Also, wishing him a speedy recovery.