Ok! I've managed to calm down a bit, and think deeper on all posts above (I calmed down by reading them over and over. Thanks everyone! )

spondiferous: You made me think something important. I need to try finding ways in which I could support a family with my art. Instead of just supposing I can't. Extra exercise and establishing a personal style would help against the burn-out too. As for science, since I never were mad scientist material, I should stop expecting to pull robots out of a magic hat, and focus on the humbler pleasures of knowledge. I can still be "part of it" without aiming for greatness. I sometimes forget that I'm not my parents, too...
So: (1) extensive googling for "survivable" art, (2) using science as a media to keep my brain sharp and to raise my job-finding chances. I haven't decided where to focus yet, I still feel "stuck" at jobs' searching, but it's a good step

By the way, spondiferous, if you work as a freelancer, it's better if you are good in a few areas...so from this aspect it's great you are restless