Wow, you've really had to deal with a lot recently. I am so sorry you've been going through so much. This all must be really overwhelming for you. I am really worried about you because it seems like as a result of having to deal with job, relationship, and family troubles, you've begun to cause harm to yourself. Although cutting gives a temporary feeling of relief, it can be really dangerous. Maybe you could visit the website: www.self-injury.net
to read some ideas and stories from other people who cut. You also said that you've been high for most of the past two weeks because of your night terror medication. It might be a good idea for you to get in contact with a doctor, even if the doctor is a friend or family member, to discuss the medication both to learn more about it in general and to learn if/when it is safe for you to drive while taking it.
It sounds like you really care about your daughter. It is very brave of you to admit that you're father had a really bad effect on you and you're worried you'll have the same effect on her. It must be very difficult to have to have the father of your child want to get back into a relationship with you, especially after he treated you so terribly and you are in a different relationship. I can imagine that this would give you a lot of mixed feelings. But as long as you think your decision is what is best for the health, safety, and ultimate happiness for you and your child, then I'm sure your decision will be the right one. I can imagine that you would be feeling very lonely but maybe talking to a close friend or family member who you trust could help you feel better. It is important to talk about your feelings rather than keep them bottled up inside of you. I work at Teen Line and I would definitely recommend calling if you feel comfortable. Calling and talking to someone who is listening and sympathizing and genuinely wants to help could really make you feel better. You could also look through the Youth Yellow pages to try to find another hotline you might feel more comfortable calling. I really hope you will consider talking to someone about what you've been going through. You've had to be so brave, both for yourself and for your daughter, and I really think it could help if you felt like you had a trustworthy support system backing you up.
Thanks for reaching out,