Your sister sounds like a right madam. My younger sister acts that way sometimes and I know how much of a pain in the neck it can be. Seeing as she's older, she should know better. Your boyfriend should also pitch in. Chivalry isn't dead, men just say that when they want to be lazy.

Sending as many good thoughts and positive vibes your way, migraines are no fun whatsoever, and a happy birthday to your mum. *hugs* feel better soon and take extra care.