Agreed. It is totally understandable to feel shitty about the situation. It sounds really hard and anyone would struggle with all of that.
My only suggestion to add is to remember to breathe deeply. Anytime you notice you're tense or feeling really bad, spend even 1 minute unclenching and taking several deep breaths from the very bottom of your lungs, let your shoulders drop, shake it out if you want.
It sounds stupid, and it won't solve the actual problems you're facing, and it may not even feel like it has done anything in that moment. But, it will reduce your body's chemical stress response just a little bit more each time you do it, allowing you to put that energy more easily into solutions. And that will help you keep moving just a little bit longer.