I am not an expert by any means, and am only going off of what I've read recently and saw in the movie "Under Our Skin":
In the movie the one doctor studied 10 brains of deceased Alzheimer sufferers--7 of these 10 had indications of Lyme (presumably through antibodies, I can't remember).
Resources also indicate that people are often misdiagnosed with what appears to be MS or ALS, and these symptoms can sometimes reverse with the right medicine. Some doctors have also begun to theorize that the autoimmune diseases we currently don't have an explanation for, such as MS, Parkinsons, etc., could begin as Lyme and then get worse if gone untreated.
This is JUST my opinion, but that last theory makes a lot of sense to me. I began to have twitching around the corners or my eyes at 27 years old. Weakness in my hands began at 28. Large leg muscles began to severely atrophy in mid-30s--much more than they are supposed to at this age. This has been accompanied by much more frequent facial twitching, weak hands and arms, and very weak legs, hard to walk. I started to suspect these were the early signs of MS but didn't want to say it out loud. Then recently, when people on this forum helped me connect all the dots, I realized it's all a part of Lyme. I just started treatment and the symptoms are starting to disappear.
I'm steadfastly believing, praying, hoping, that I am able to cure this long-standing infection for good. I reject and rebuke the very idea of this becoming worse!
I know it's hard, but try not to worry about
it and know that at least you caught it and started treatment for Lyme--which has a much better prognosis than MS or ALS!