You're not that complicated re the humour, Nora..Plenty of comedians are depressives and use humour to self-medicate. It's a really effective way to keep your head above the water. I used to be able to use humour effectively too to cope with difficult times but have not found it so helpful now.
I'm so sorry you are struggling badly. I hope you will be able to get some happiness from the prospect of a new granddaughter which must be exciting after all your boys!
I feel for you too, PM..I'm pretty isolated too with loads of responsibilities and wondering how on earth I would cope if I got covid badly. Mustn't try to predict the future though but it does worry me.