It’s such strange times now for everybody being in isolation, that probably won’t help you either.
If you can find a little motivation to look after yourself, little steps can all help too.
Exercise and fresh air really do help, which I appreciate might not be easy right now, depending on where you live. If you’re lucky enough to be near open space, maybe aim for a 20-30 min walk when you can, or lots of free workouts on YouTube at the moment.
Little changes to diet may also help, so eg Brazil nuts are always mentioned to boost serotonin levels, most nuts and seeds will help, as will oily fish for the fatty acids, eggs, turkey, bananas, dairy are said to be sources of tryptophan, which helps boost serotonin. B vitamins also supposed to be good. (An easy source of b vitamins are many breakfast cereals are fortified with them).
Try make time for a bubble bath, paint your nails, hand cream, it might sound bonkers and irrelevant given how low you’re feeling, but equally might just give you a little boost to look after yourself. Just focus on what you’re doing one step at a time.
I appreciate it’s a vicious circle, because often you can’t be bothered with anything and don’t want to make any effort. I’m not saying for a minute that any of these actions will make you feel better, but little steps like this that help you think about making changes and enable you to look after yourself a bit, might just lead on to the realisation that with little steps you might just be able to change the way you think and deal with things, whilst hopefully finding an antidepressant better suited to you and possibly CBT or other.
As pp say above, mindfulness might be a way to help you process your thoughts and how you deal with a situation.
NHS mindfulness link