Any time the idea of trying to itemize and research my food is overwhelming, I use the Notes field in the nutrition tracker to type a few notes on what I ate (with as much detail as I feel up to including). I might not know the exact calories and nutrition breakdown, but at least the food is on the record. It helps me close the book on that meal or that day and stop obsessing. At a later time when I'm feeling more up to it, I can always go back and try to enter the items "officially."
This has been particularly helpful for when I eat at my parent's house or in some other situation with no nutrition information available.