A good start is to understand the value of you're earlier experience and find some positives. You will certainly have learned some skills. You'll have learned

A good start is to understand the value of you're earlier experience and find some positives. You will certainly have learned some skills. You'll have learned what you don't want in a job. Even menial work can be used to demonstrate grit. Anyway, starting from zero is hard, but least because you'll compare yourself to people who haven't. Much better to salvage what you can from the last decade and realise that you aren't starting from zero at all. To me, what jumps it if your post is, this person is miserable and not at thier best psychologically. You better believe interviewers can smell that and sadly they don't like it. Suggest that getting some counseling might help you more careerwise than another tech skill.