Welcome to the team. I don't have Lyme but do have fibromyalgia and some sort of arthritic something or other. I went GF because of IBS symptoms, but am finding a reduction of pain. It's not dramatic for me, but is slowly happening.
As for weight gain, I've lost some since the end of July. I've certainly lost the fluid gain, which is, I think, a lot of the gain from things like Lexapro. Don't beat yourself up over the weight at this point. Just work on getting healthy. That in itself is a major accomplishment. When you feel better, you'll want to do more. I think my body reset itself somewhat when I went GF.
God bless you on this new adventure. Lyme is a nasty thing to get over. Be proud of yourself for taking charge of your health and not just waiting for the "professionals" to do it. You know your body better than anyone.
"It is only with the heart that one sees rightly; what is essential is invisible to the eye."
Antoine de Saint Exupery: The Little Prince
"To the world you may be one person, but to one person you may be the world."