Do you (still) only feel like that in the mornings?

I now experience that when starting the day. Only when it gets worse is it like that all day.

Maybe get some stimulation from nature or crowds of people. That often breaks such mood if I take it seriously enough: when I try to fight it and not see it as predestined. If you're quick to act, it might not consume you.

Try not to think, try not to feel anything as a result of your thinking and try to just feel. In the end, feelings may control you, but thoughts only do when you let them.