Where exactly are you doing your volunteer service kabayan? BACK when I was a fresh local board passer and looking for a decent job there in Manila, I had known some of fresh nurses who were doing the same thing you're doing right now. At first, yes, they said the feeling was rewarding as they're gaining lots of training but in the long run it looked like it wasn't FAIR!!! I know for one, this hospital in Manila which asks certain fee for the nurses to do their training and will see what happens next. There are also hospitals that play the game, you know. Accept some trainees (registed nurses) and make some false promises. Horrible!!! Very opportunistic!
I suggest that you apply to a decent hospital that will give you your due. It is given that whereever you go in any part of our country, the salary is low. That is a fact and nothing can be done until the gods wipe out all the ba*tard politicians in the position.
If you're just around Manila, try Manila Doctors, MAkati medical Center or Our Lady of Lourdes

(unless you hate religious things and hate certain denominations). And when u apply, be prepared and practice on how to make them think that you are the one they need among the applicants. Yes, you have the patience and they said "matiisin" but my, dear, you have to ASSERT yourself. That is the NURSE!
Goodluck!