Yes I know all to well about lyme disease. I am sorry that your dog has lyme disease. My dog Daisy had it and she did not have any symptoms except that she was starting to limp so I brought her in to the Vet.
Lyme disease can lay dormant in their system and flair up at any time.
I would like to suggest that you get your dog on probiotics which helps build their immune system..
here is some information on lyme
Lyme Disease (Borreliosis) in Dogs sending prayers for your little one.