Awwww good boy and NOOoooo on the lymes.
Like Brembo said, my understanding is lymes is very controllable though. I'm sure some of our holistic knowledgeable folks can give some advice on boosting his immune system as well.
If Sinister has a good immune system along with the antibiotics he should be just fine.
One suggestion I have is getting him started on Olewo Carrots (my dogs love the stuff) it helps keep the gut and immune system healthy.