Life is full of paradoxes. Manic-depression makes these only more extreme and apparent. It's basically just extreme living. Basically, if you can don't, if you can't try: that's my advice. But trying doesn't necessarily mean trying what you can't do. Try to do something like it but not it, somehow less of it. It sounds like rubbish, but it's just paradoxical, not illogical.

Much of how we respond to depression (or whatever underlies it) is good, too much of it very bad.

Isolating is good, too much of it bad, but if you can't socialise, don't: it'll hurt you more. Then try something else like it: just go to read a book in a park, watching people, for example. Or go to the cinema or go to a lecture somewhere. Or attend church, but don't interact (apart from polite niceties). Anything to release anxiety or excitement: interaction tends to increase anxiety or excitement, just observing some "chaos", interaction between other people or nature or a film, ideally rapidly changing, will lessen anxiety (or excitement).

You don't have to do anything, but you have to try and do something, but not something you "should" do. Try something like it, but easier.

Do the bare minimum, then a bit more and gradually more still.