I went and looked at your other posts before responding. It appears to me that you may need some help for depression, and that isn't surprising from what's been happening in your life. You gave some good advice to another person in one of your posts. You might want to go back and re-read that. I definitely agree that you need to be sure to keep your relationship with your daughter's father on a level of he's just her father, and not your sexual partner. If there's any chance that he could become more to you, having sex with him at this point isn't going to enhance that possibility. If there isn't a chance of more with him, then you are taking the chance - no matter how you use protection - of having another child by him and only complicating your life more. You don't want to do that, for your sake or your daughter's.
I agree that getting involved in a good church should help. Also find things to do for others... not just your extended family and friends, but people you don't even know. When we are interested and doing what we can to help others, we tend to forget our own problems, or at least be able to cope with them better.
It sounds like your mom and sisters do need you at this time. Perhaps they are so caught up in your Mom's illness
(from one of your other posts) that they don't have the time or energy to listen to your problems. It sounds like your distance from them has built up prior to your Mom's illness, but perhaps this is a good time for you to really reach out and close that gap. You can't just wait for them to come to you, but need to take some significant first steps toward them. Are you in a position to offer to help your Mom with things she needs done... take her to doctor's appointments, clean house, shop, etc.? If you are and she's open to accept your help, this might be a great first step to get her and your sisters involved with you and your daughter. Perhaps she'd just love for you to visit her and let her spend time with her granddaughter. I don't know how much of this you have done, and you don't mention if your Mom and sisters even live in the area, so these are just suggestions that are "shots in the dark".
I too will be praying for you.