Ever feel like you are drowning? Like too many things going on? Like you will never surface and take a good breath?

I'm already caring for my mom
I'm already caring for my ex-father-in-law
I have things going on where I should be taking care of myself but I always put myself at the bottom of the list.
My ex-husband has bipolar disorder which is why it makes it difficult for him to care for his dad. And now to find out he has cancer. I feel like I'm screaming and no one's hearing me. I feel like I'm tired and I'm going to just crumble. But I also know that I need to pick up all the pieces and keep going no matter what.
What do you do to reset?
What do you do when there are too many things going on at once?
How do you keep it all together?