Weird no sugar added reaction

Hey everyone I need some opinions. Here's the 'short' story. I was eating some gummy bears and saw they were sugar free (no sugar added as well) didn't think anything of it because i didn't eat very many anyway maybe 8 gummy bears in all. That night I had very bad painful gas and diarrhea, again thought nothing of it except maybe it's the gummy bears. So next day tried the same thing small hand full and same thing happened again. Today I had maybe 3 bears.... Same thing happening. Is this normal?? I've never had a reaction to no sugar added and sugar free and I know this can be a side effect but I thought that was only if you ate massive amounts of the stuff.... Could it be an allergy?? I've never felt so stupid asking such a weird question!!