How to be happy?-such a simple question

I am really struggling at this point in my life. We have been ttc for 7 months now. We conceived 4 years ago without trying but ended up getting an abortion because it was not the right time. I just feel like I'm in a bad mood on a daily basis and I need to fix something in my life. I am almost 26 years old and I don't feel happy. I take a lot of frustration out on my husband and I feel horrible. We are house hunting and that's stressful. If anyone has tips or words of encouragement I would really appreciate it. Thank you in advance