I'd be keen to hear from any nurses or paramedics about what the job entails
Nursing is probably the better option to begin with, navigating a foreign language and culture on top of dealing with people in crisis situations... too steep a learning curve I think....
for nursing you'll need to contact the 'izba pielęgniarek i położnych' for the województwo you want to be moving to, nb getting responses in English won't be quick
There are definitely non-Poles in the medical field here. Many were educated in Poland and stayed or moved back from their own countries. I've seen a couple of non-Polish doctors over the years (one from Syria one maybe Ethiopia but I didn't want to ask and seem nosy).
The big hurdle is the language, not just understanding patients and colleagues normal speech but also medical Polish.
The good news is that medical Polish is much closer to normal language than Medical English is to normal English. Most terms are built out of Polish roots (some greco-latin borrowings too but mostly Polish roots).