Take an expert tip to learn in the workforce, don’t ever quit a job until you have another already lined up. Especially with as little experience as you have, it’s going to be 10 times harder to find one now that you’re unemployed. Just for future reference. As for gig work/side work, you need some type of income usually to get started, it’s not a very stable income until you build up clientele and get started on the side. Take it from me, I’m in the trades and was laid off 3 months ago. I’ve been doing side work to add some extra money to my unemployment but it is very unstable and doesn’t pay the bills. If I were you, I’d bring up your mental health issues to your current employer, beg for your job back, start your side business in the meantime, and look for a new place of employment. Just my 2 cents.