Lab tech or Animal tech. It won't be the pay, but sometimes it's not about who has the best degree etc. If you love the work you could go back to school...
If you have a friend or family member close by, ask if they can help for a few hours or a half a day so you can get some rest or excersise. I used to...
kikcind - you are so right - it is so hard to push yourself forward when you feel alone. Believe me I understand; but you are doing the right things...