--especially those with some sort of nutritional or autoimmune component (if that can actually be determined) are prone to "flaring", or what might be called, in the MS model of autoimmunity, "relapsing-remitting".

Such up-and-down symptom patterns are, of course, common in autoimmune conditions, in which the antibody load and attack on tissue fluctuates over time.

Moreover, with nerves, increased symptoms can often signal some form of healing attempt--it's not uncommon for nerve growth cones fighting through tissue to produce signals the brain has difficulty interpreting, and these feel like pain, or shooting, or tingling, or the sensation of something on the body that isn't there . . .it's often difficult to tell what's happening overall except in long-term retrospect (the reason many of us keep diaries).