Generally when you're in an increased state of anxiety... as you seem to be... normal things that you do such as casually playing guitar may become difficult when you add a stressor... such as adding the thought that when you're recording you can't mess up. Kind of like you may be putting a certain amount of pressure on yourself do to the anxiety and stress that you're feeling. I'm sorry to hear all that about your family and yourself...

The only thing i can think of is to sit back and take a few deep breaths and try to relax before you record. Maybe have a beer or something... haha.