I totatally agree with that. If found it is very difficult to find sounds and apply studio techniques when I'm stressed out about some ****..I got around this problem by having pre-pared tracks to work on when I am really not focused.It works out pretty well because the stress adds tension to a track that didnt have it before.it's probably different for everyone. I personally have to be in the right state of mind to make music. choosing the right sounds could be tedious work sometimes and requires patience, and stress doesn't help me with that at all.