Can artificial sugar cause no energy and stupidity?

I'm 3.5 years post op and still with no energy. My depression is scaring me (yes I take meds and have counseling). Also it seems that I am totally stupid. And the thing is I am NOT. Not to brag, but I can repair and build my own computers, and I do pretty good with many aspects of troubleshooting problems with them. So I am NOT stupid! However I can not concentrate or focus on anything. My depression is getting so bad that I'm a mean $@@$$!. You fill in the blank. I'm not a mean person. Yes, I know depression can cause low energy and nastiness. However I remember years ago on TV that some pilots were being interviewed. Thanks to Aspartame some were having seizures, others were having problems with concentrating, metal sharpness, and I'm thinking possibly low energy. Anyway, I use (ballpark figure) 25 packs of Walmart's Aspartame a day. I drink alot of coffee and also like it in diet pop. I prefer Splenda however even the better value big bags are terribly expensive. However I am trying an experiment. I'm using that instead of the Aspartame for at least two weeks. I want to see if any of this clears up without Aspartame. Does anyone have any ideas if Aspartame is linked to low energy, depression, lack of mental clarity ect? Thanks.

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