welcome to pc! i'm glad you found us. it's a friendly supportive community i believe. the ppl here have helped a lot during rough times and i hope i do the same for them when i can.
is there any way you could get a medical leave from school until you become more up to the task? from what you've described you have an awful lot on your plate right now. my concern is your not being able to deal with everything, including self, and stay focused on school. your not being to class will hinder your progress as i'm sure you know. so rather than doing poorly with your senior year, a hiatus might give you time to sort out everything and then get back on your feet. your job may be on the line too since you aren't able to bounce back up.
so often i've waited too long to get the help i needed. don't beat yourself up about it but your mental health-iness is vitally important. right now that may need to come first. chatting with your hubby about how you are feeling will help too. i am sure he knows, is worrying, but waiting for you to let him in.