It sounds like your going through some stressful times. Is your ex not prepared to help you? Surely he wants to know that his daughter and mother to his daughter are housed safely and properly?
I’m a landlord. I, aswell as most landlords are normal human beings with emotions, I’m sure alot will be happy to help you and go that extra mile to make sure your comfortable, considering your circumstances
What area of country are you in? I’m in West Yorkshire. If your close I could help.
Scott x