I'm sorry to hear that things are so tough for you and your daughter at the moment. I just wanted to let you know that I'm thinking about you. You have come onto the right place as there are some really helpful people on here and I have found the advice/listening ears really comforting at times.
I don't have any fast answers for you, but all I can say is I know exactly how you feel as my husband has a Personality Disorder and OCD and I know how draining caring for a person who has those conditions can be. Whilst I don't have any experience of Bipolar, seeing someone you love struggling with OCD and a Personality Disorder can be soul-destroying. I too am struggling at the moment as recently my husband's conditions have got a lot worse and I don't have any support. It can make you feel really ill and isolated, but all I can say is please look after your own needs first and try to make time for yourself by taking time out to spend time with family/friends and doing hobbies that you enjoy. Time away from the house, even for a couple of hours, can help to recharge your batteries and will help you to start afresh caring for your daughter. You will help your daughter immensely if your physical/mental well-being is looked after. I know it is easier said than done as in the past, I have ignored my own physical/mental health and put my husband's needs first and it has totally overwhelmed me at times and you just end up feeling more depressed, isolated and even resentful at times of your loved one.
Also do you have any support in the form of your GP or CMHT team for your daughter? In the past I have actually gone to my husband's GP myself and explained my concerns to her, as my husband refuses any help with his conditions. Just speaking to the GP and letting her know I am struggling a bit has helped.
I can relate to you feeling like you are the one who is ill as I feel like that at times too and blame myself for my husband having his mental health conditions; however I do know deep down that it is not my fault. Sometimes even doing things with your daughter can help, even if it is going out for a walk, doing a jigsaw or watching a movie together, as it lifts both your spirits a bit and stops you both focusing so much on the mental health conditions; I find it helps sometimes anyway.
You are doing so well holding down a full time job and caring for your daughter as that must be really challenging at times. I don't work due to my disability (I have Spina Bifida) and my husband doesn't work either (as he is my carer), and find it tough enough coping with him without working.
Your local Carer's Centre may be of some help too.
Sorry I can't be of more help, but I am sure that there may be other people on here with other advice. I come on here from time-to-time so if you ever just want to talk then I am happy to listen.
I wish you and your daughter all the very best for the future and keep your chip up.