Shari, you call it a funk, but it sounds like you're feeling resentment. And if anyone has ever had a reason to feel that way, you definitely do.
You are being completely taken advantage of. If you can squash it down then more power to you, but it's been my experience that when nothing changes it just rears it's head again. And it has a way of turning any positive feelings you have for those into negative ones.
It might be time to reevaluate your priorities and your needs and decide how much you are willing to give of yourself for nothing in return. Not even a thank you. Only a 'charge easy child $20' and what more can you do for me.