Hey -
Sorry you had to go through this. I know exactly how you feel. Not long after moving out here, Bandit went through a series of cluster seizures - lasted a good 4 hours. Longest night of my life.
Anyway - I love this site:
Canine Epilepsy and Dog Seizures Table of Contents - Canine Epilepsy Guardian Angels
If you look under disease/disorders that can cause seizures it does list tick borne diseases.
One thing to watch is change in weather. We have changed food, but I still notice that if the weather changes much - like when it storms we are probably 40% more likely to have a seizure. I noticed this when we left here (probably a year ago) - 60 degree weather and when we got to Iowa, it was 20 degree weather - sure enough that night Bandit had a seizure. So there is another thing to add.
One thing that helped me discover what might be causing them is to write in a journal the date, time, weather, activities of the day, how long the seizure lasted, and severity. You will begin to notice patterns. For example in Oklahoma, Bandit always consistently had seizures at 4 in the morning. Here they are more in the afternoon/early evenings. This also helped me realize the weather connection.
Okay - one last thing
The site listed has a section for before/during/ and after a seizure. I cannot prove that the ice pack thing actually works, but we do it every time and it seems to help keep him a little bit cooler and he does seem to snap out of them a little quicker afterwards.
Using an ice pack to stop canine seizures
Like they state - all else fails, you feel like you are doing Something.
Oh - and something I have recently noticed - after a seizure make sure that he is completely out of the seizure. I let Bandit up once and let him outside too quick, and he came back in and went into another seizure. So now when he starts to come out of the seizure and wants to sit up, I make him lay there for a little bit longer, then let him sit up and stay there for a little while, then finally I will let him go outside. It actually took me a couple of times of cluster seizures to realize that I was too quick in letting him get up.
Anyway, hope that this helps - if you need more, let me know.