Do you have any idea yourself about what it is (in particular) that is getting you down, nananet?
It's true that a lot of people are feeling low just now, and it would be surprising if that were not the case, but I've never found it useful to be told that I'm not alone with whatever is bothering me. I was brought up like that - 'well it could be worse - think of all the poor children, and don't be ungrateful', sort of thing.
These days, it has become almost a competition, I've noticed. As soon as someone says that they are sick of being stuck indoors (for example), someone replies with 'Oh, you aren't the only one - I've been stuck indoors and the loo roll is running out!'. I am using a silly example deliberately, but it can be a bit like that, and it can put people off saying anything and make them bottle things up, which is unhelpful.
You mentioned your husband and marriage - is that what is getting to you? Again, it can be a strain on the most loving relationship to be cooped up together for long periods. I'm not asking you to comment on that on here (unless you are comfortable with that), but to suggest that you try to pinpoint the specific nature of what is getting you down, so that you can perhaps address it more usefully.
I know that a lot of people are suffering from health anxiety, which can be paralysing. If that is the case, there may be online support groups, or your GP may even be able to help you to access counselling. If it is depression, then maybe a short course of anti-depressants might help. In either case, as Alexa points out, a quick chat with your GP could be a good place to start.