I am so sorry that all this has happened. You have had a truck load of things to deal with. Even one event on it's own would be devastating enough let alone all the others piled on top. No wonder you feel the way you do.
Are you under a doctor's care for your cancer and migraines? Grief has a huge impact on our physical and emotional condition. You have been so debilitated that you need and deserve professional help. Find and doctor and therapist that do give a d a m n. Let them know about what is happening right now. Maybe even give them a copy of what you have said in the post above if that makes things any easier.
Feel free to continue to post here. You are heard.