Diet Soda and Breaking Out

I have not broke out like this since high school and the only think that I can attribute to this sudden break out is diet soda.  I accidentally got diet soda last week and I have been drinking it and ever since then I have had break outs on the t-zone of my face.  It is very upsetting to say the least!  I think it could be the phenylenalene that is the cause of it. Did you know that this also attributes to childhood hyperactivity!  And they have this stuff in the Flintstone vitamins because they want them to taste good.  That is just horrible and I wrote to the company to say how wrong that is!