Stop whatever I’m doing. (I’m not going to make a good effort at it anyway)
Take a vitamin D supplement. (I definitely don’t get enough sun and that can boost my mood)
Go for a 5-10 minute walk and try to get some fresh air while trying to sort out if there is a reason I feel that way.(If there isn’t a reason, then fine, but if there is, you now have a problem that you can look at it more logically)
My strategy for when I recognize this in myself: