If you are looking for higher monthly revenue, then perhaps you can think of freelancing.
It can be an additional revenue stream, as well as a way to indulge in the technologies you like. PHP projects are by far the most requested ones on freelancing sites like elance and odesk.
Most buyers on online freelancing portals are ok - in fact prefer - remote workers, and are not bothered at all about medical conditions as long
as you deliver promised results.
Another source of jobs is
Hacker news where every month there's a "seeking freelancer"
thread.
Here is this month's.
Most of these are SV startups and are usually ok with remote work. Being skilled in Ruby and RoR is a plus there.
I've read that Slovenia itself has a vibrant startup scene, so you can try moonlighting as a freelancer to your local companies.