I have no idea the exact date it started. I have noted that it is definitely affected by anything with chocolate in it also caffeine makes it scream. I do avoid all sugar, I use sweeteners instead (liquid splenda) which so far has no effect on the volume.. I am learning as I go as to what foods I am sensitive to and can pretty much control it that way... It is never completely gone but it does calm down when I avoid the contributors. It screams when I slip and eat something unknowingly that had chocolate in it.. I love Chocolate!! 
