OK, after two weeks on being off folic acid and using a magnesium supplement, I have had no sneezing fits, other than one today from a drippy nose, it stopped and no more fits. I will try adding folic acid again, and see if the fits come back, and stop the magnesium at the same time. It would be nice to conduct a double blind experiment and have a tablet of the same size shape of something that is benign to be 100% sure there is not some type of psychosomatic effect, but I won't be able to do this.
Funny thing happened on a plane flight home the other day, two people in front of me about 4 to 6 feet away had two or three sneezing fits, and after each one I felt the histamine levels rising, so much so that I used the lip squeeze/shake routine which suppressed it each time. I know for sure that yawning is contagious, but I never have heard of sneezing through the sudden buildup of histamine before. Has anyone ever had this happen ?
What you describe, persistent tics for extended periods is very weird, are you sure you were not possessed (lol) at the time ? Are you sure you were not dehydrated and did not know it ?