Daa.... now THAT is something that can really mess with one's mood and mental state quite easily. Just read up on it and the multitude of different effects its had on others depending on the type they are using and in conjunction with things as simple as artificial sweeteners...
If your already consuming aspertame then it can take very lil daa or sda to tip the Neuro effects into the toxic or side effects range...or you may already have a susceptible brain chemistry that doesn't lend to being effected well with excess daa... those effects very much so can be immediate where as hormonal effects cascading into mental effects typically take MUCH longer.
Personally i love daa and the great effects it can bring, but just look back in the archives of almost any nutrition board out there and the flurry of worried posts that were made by many knowledgeable members thinking it would be ALL bad to supplement with such a compound(DAA)... luckily it turns out the issues are few and far between when taken at the therapeutic rec doses we use but still there are many that have issues with it, some with different kinds or manufacturers variations more then others, but just the same it's a possibility....
again I'd also drop all aspertame sweetener use for sometime before and after running a course of daa or sodium d asperate. I didn't the second time i used bulk daa and had some anxiety issues crop up, not severe, as I'm not an anxious person typically, but noticeable. It ceased after taking a break and dropping the Wal-Mart/great value "koolaid/crystal light" stuff i was using at the time that contained aspertame as the sweetener.
Good luck regardless
Ltl.. Thanks for the compliments on the avi, but i can't claim that's current sadly... that's from back in 2008... I'm a wee bit chubby right now @203 and posted that as self motivation to get back down to a lean and mean state. Shouldn't take long honestly with what i have planned.