How can you keep positive and happy enough to continue Work and hobbies when Have medical condition?

I have knee problems but i guess i’m used to that so that didn’t bother me that much. But now i have a new thing with my heart/chest. I’m getting worried and then i’m in pain too( not much but it’s there).

I have hobbies such as animation and making animated movies..or making music…These things take concentration and you have to be happy and excited…But i’m not feeling that anymore because i feel like i’m a total mess because i keep getting knew health problems every year.

-Also notice, no insurance
-My problems seem to be rare and would require special testing and no doctor in the free clinics would help me with that
-Also my teeth are getting cavities and stuff. that’s also making me feel bad because teeth problems on top of more medical problems and i don’t afford it.

I had been excited these days, i was making progress on my art projects . Should i keep at it or just give up and sleep all day?