How can I get past these feelings of giving up and find happiness?

Try and change the way you look at life. Look at the hard times as just a way for you to grow and learn. The way I look at challenges is that they aren't there to keep us down but rather to help us develop into better people. We wouldn't be given them if we couldn't over come them. Know that life will not be like this forever. You are on this planet for a reason and a purpose and things won't be bad forever. Try and work things out with your husband and daughter whatever the problems may be. Family and group therapies are great ways to help and even individual therapy could help you as well. Best wishes and keep your head up! =)