Hi itstricky - welcome. It's so great of you to be helping out your son - having a good support system can make all the difference in the world!
I don't have any doctor recommendations for CT, but I just wanted to chime in with some information - there's a lot of talk about certain diseases - ALS included - being misdiagnosed when it's really lyme. Might be worth looking into just so you know what you're up against. I actually just got into this long discussion with my doctor the other day about it, and how in her practice she's seen ALS associated a lot with biofilms, and/or this thing they're only now researching called protozoa fl1953. I don't mean to scare or overwhelm you with information - I just wanted to share so it's in the back of your head if you end up looking for any missing pieces of the puzzle.
I'd also suggest taking a look at the new to lyme thread - there's a lot of great information there to help wrap your head around all of this stuff. Best of luck to you and your son, and don't forget we're here to help!