I think everyone is guilty of this at some point .. I have done it many a time. I finally got fed up of ruining yesterdays good mood by over thinking today lousy mood.
Enjoy the hell out of great days , accept the bad times but use your coping skills ten fold to try and minimize a lousy day .. A lousy day does not always mean your headed for a depressive hell. <~~ That I think is a hard thing to rationalize or at least it has been for me. Everyone have lousy days .
My MI free husband was in a great mood yesterday, today he is a grumpy a.s.s .. no real reason he just is .
Just try to stay in the moment ... Mindfulness is so helpful, Yes I post alot about it ... Because it works