Over the last six weeks I have had a number of sudden bouts of upset stomach, usually lasting one or two episodes, sometimes up to five hours worth. I have also had two unexplained episodes of sickness, lasting one or two bouts. I am cutting out wheat to see if this helps but I have had no problems with wheat before- is it usual for this to become a problem suddenly. Does anyone have any experience of something similar or any other ideas about what could be causing it? Thanks!