I'm sorry people have been stressing you out. I mean, seriously, you're doing them a favor and this person doesn't even say thank you? I mean, that's just manners. The least a person can do is thank you for helping them out and it seems like you're doing more then just giving this person a ride...seems like you're hiding something they're doing. And in that case, this person/these people should be extra nice to you.
I know what it's like, trying to help someone beyond help, getting stressed out because of it and when you do help that person, not even getting a thank you. So, I really hope that this settles soon because no one deserves it. Nice people always seem to get the shit shoveled onto them and I hope it stops soon.