You messed up. Admit it to them. If they are your friends, they will understand. You may have already lost them by lying. You have nothing to lose.
Ask someone to help you get help. Go to a doctor. Get a diagnosis if needed. Do what it takes to make you better, then repay in the future. Admission of guilt often causes more problems temporarily. Be prepared for that. Maybe don't tell them you know you did it yet. Dunno.
Get you figured out before it happens again.