How do you fight off an impending anxiety that everything will fall apart? (And how do you establish healthy work boundaries?)

I’m wondering if this feeling will go away once I’ve actually moved, but every few days I suddenly feel extremely anxious, asking myself questions like, “Is freelancing really a long-term solution? What if I can’t hit my monthly income goals while I’m abroad? Should I switch gears and try to find a full-time remote job instead? Will everything fall apart?”