I'd be more concerned with HBO treatment. In the research I've done, I've found connections with neurotoxicity and an increase in nitric oxide, which can cause damage in the brain. I've given more info on nitric oxide in my endothelial health paper highlighted below...
Yes, garlic enhances the immune system. If you believe MS is autoimmune, you should avoid it. My husband takes a much smaller dose, but I believe MS is a nitric oxide imbalance and cerebral endothelial dysfunction...not purely autoimmune.
http://jap.physiology.org/cgi/content/a ... /88/4/1381
We have tested the hypothesis that cerebral nitric oxide (NO) production is involved in hyperbaric O2 (HBO2) neurotoxicity. The data provide evidence that relative lack of NO activity contributes to decreased rCBF under HBO2, but, as exposure time is prolonged, NO production increases and augments rCBF in anticipation of neuronal excitation.
Hope you're on the mend, and talk to your doc re: HBO treatments.