I haven't noticed any side effects using DAA apart from a little stomach discomfort when dosed an on empty stomach now and again. With regards to what you are noticing it is difficult to ascertain why this is happening, I know the NMDA receptor is responsible for a whole host of cognitive functions and so forth so maybe it could be a possibility that over stimulation of these receptors could be causing the release of far too many stimulatory neurotransmitters, such as glutamate, leading to the side effects you are noticing.
It is worth looking into anyhow and most definitely worth taking an extended break from DAA containing products.