Changeling, it sounds like you need to phone your pdoc and get him to fit you in ASAP. If you do not have the strength to function and look after yourself, you cannot expect to be able to look after your child too. I'm very sorry your family does not understand and on top of everything even make you feel guilty for feeling down. If for no other reason than your daughter, please call the doctor.
Hospitalisation is only one of the last resorts, and even then you should not ever be ashamed. Your doc will be able to tweak your meds and help you feel better.
I have recently had my mood stabiliser increased; I'd phoned my p-doc the day before as I was so down and on the verge of being suicidal. She made a plan to see me the next day after I made it clear how bad it was, we doubled my dose.
I also have Xanax, but only use it very rarely at the moment.
Please don't consider your decision as selfish that you seek help. You really sound like you could do with the break, the understanding and the help

((((HUGS))))