I hear you 
Sometimes I force myself to acknowledge something positive in my life/surroundings, in the moment, even if it’s just for eg: “I love that plant, it’s looking healthy, I’m glad I got that pot for it”. And then try to find another positive thought, however low key. I try to create a chain of positive thoughts which do not match my initial mood.
Tea/coffee in a good mug.
Paint your nails a bright beautiful colour, if you’re into that.
Listen to podcasts whilst cleaning/tidying up - something absorbing or with positive wellness content such as Dr Rangan Chatterjee.
Declutter one small area, only spend ten or fifteen minutes - not too stressful and a sense of increased order.
Go for a walk/walk the dog.
Text a friend.
I also like WH breathing.
Music music music.
Plus sometimes the tapping technique can be surprisingly helpful: Nick Ortner.
Watch absorbing telly in the eves and maybe do something receptive and creative like knitting.
Will follow this thread with interest! Sending solidarity 💪🏼