That's awful. I'm sorry to hear that.
I don't doubt that you had Covid, but you may want to try getting an antibody test to confirm it.
Your attitude toward this is commendable. If everyone thought the same way, we might have been able to get the outbreak under control early on.
I'd like to present the case though for including, or even deliberately pursuing on-location work, assuming you get a positive antibody test result. Let's say you're correct, and there is some non-zero chance you've still got the virus and can pass it on. There haven't been any recorded cases of people transmitting the virus 14 days after first showing symptoms, so if it is possible to still transmit the virus, the chances are statistically very low. There were some early reports of people getting reinfected, but those seem to be accounted for by testing failures in the early stages of the pandemic, so statistically, your chances of reinfection would also be very low.
There's really no doubt that people who haven't had the virus yet are at significant risk for both acquiring, and then transmitting the virus, if they can't maintain social distancing. If your risk for acquiring and transmitting the virus is much lower than that of others, then if you were to replace a worker who is at high risk, you could probably play a significant role in breaking the chain of transmission. Also, being willing to take on-location work would greatly expand the pool of jobs available to you, so this might benefit you directly as well as serving the greater good.
I respect that you may not come to the same conclusions that I have though, I just wanted to present a different perspective on this.
Whether it's remote or on-location, a weekend job would seem to fit your $15-$18K income goals. A weekend job might also be easier to get, as many people don't want to work weekends.