GLPers I NEED your input if your dog had Lyme Disease

My Lab puppy started limping (traveled to different legs) when he was 3 months old. I took him to the vet 3 times for it and she told me she suspected growing pains. After the 3rd time, on October 31st she tested him for lyme disease and it came back negative. ($100's of dollars for 3 visits and lyme test)

He is now almost 8 months old and still limping. She urged us to do x-rays on him to rule out some other possibilities, so last Wednesday, we did the x-rays ($600). The only thing the x-rays showed was a swollen knee, so they started telling me that he might have a torn ACL or OCD.

In the mean time, he started having mild seizures. His first one was Feb 2nd, and he's had 2 more since then.

I was waiting for the x-rays to be done before I talked to the vet about the seizures. So, I went to see her today. They did a full blood panel, a urinalysis and I told her I wanted another lyme test. ($400)

In the mean time, she referred me to a Orthopedic specialist for his knee and a Neurologist for his seizures.

Tonight, at dinner time, the vet called and told me the Lyme test came back positive! (Everything else was normal)

My question...do any of you have experience with this?

Do you think lyme that has not been treated will cause seizures? Does it sound like lyme was his issue all along?