Yes but there's a generational split. Most aspiring or "resting" actors are young (look at Spotlight books, the section for age 18-25 is like five times thicker than the section for 45+) and actors in their teens or twenties tend to do temping or stuff like retail, barista, or waiting tables. A lot of young actors work in theatres doing FOH work, and theatres like to hire actors for those jobs. If you're 20-something, physically fit and healthy and have lots of energy, it's not that hard to find casual work to fit around auditions.
Acting has a very high dropout rate, most people who don't 'make it' end up quitting and doing something else. Actors who are still acting in their 40s or older (without having "made it") tend to either be financially supported by a spouse, or have found an alternate stable income. A lot of older actors teach, for example. Some get qualifications and do a "proper job" (I know one 60-something actor who's a qualified and in-demand bookkeeper). Some make good money from stuff like audio books.
None of those things are really practical options for a nearly 50yr old with health problems and a substance abuse problem.