I started a new strong probiotic a few days ago and I am also having this happen to me. Jaw tension like TMJ I also feel like I have arthritis. I think for me, this is detox and die off. I just read an interesting post on the Candida Forum . That related to toxins and candida. It was in response to someone with a query about being tiered after meals. The issue is similar in that it is related to toxins associated with candida. Look at that post and research molybedum. I hope this is useful.