Leena,
My only advice would be... Come to the states! We need more people like you 🙂
Seriously, it sounds like you're pulling a major load. In the states it sometimes helps to do scientific research. Does it work that way there, too, or are they mostly interested in your good will towards humanity? In any case, you might think about it, although it might be best to wait until you've finished some of your other committments.
If you aren't at all interested in research, what about volunteering overseas? I'm sure you're eligable for some sort of program, given your volunteer background. It doesn't make much sense, but sometimes people are more impressed with teaching kids English in Afghanistan rather than North Chicago, you know? And, frankly, you might have more free time.
Best wishes,
Anka