Hi, Liza-Jane, just wanted to welcome you to the community. You'll find lots of support here, and probably some answers to your questions also. I'm not sure if you've looked around on the other forums, but here is our "MS Community" link:
http://neurotalk.psychcentral.com/forum17.html
You also might find some help and/or friends who have had experience with Lyme on this forum:
http://neurotalk.psychcentral.com/forum91.html
Feel free to jump in anywhere. Sometimes it just helps to connect with someone else who "gets it"!