RN...hating night shift...don't know what to do.?

Ok, so I've been an RN for 2.5 years. I'm now on my 4th job as a nurse since I just cannot find my niche in nursing. I worked med/surg at first (while pregnant w/ my 2nd child). I ended up getting offfered another job while on maternity leave making alot more money so I decided to take it. That job was at a plasma donation center. I absolutely hated it. After awhile I would find myself actually crying on my way to work because I hated it that much. So I decided to go back to the hospital field on med/surg again at a different hospital...ended up regretting that pretty quickly. I then found what I thought to be my dream job at a different hospital...obstretics. I LOVED my clinical rotation in OB in nursing school and just knew that that was what I wanted to do. So I applied and was interviewed and offered the position...the only downfall...it was nights (3 12 hour shifts). I was told when I was hired that I would probably not have a chance at getting a day position for at least 10 years. I was just so excited I didn't care. Well now I've been there since April...I oriented on days for 6 months and then went to nights. I really like the job itself but HATE nights. I can't sleep during the day. I have an hour commute and have found myself many times trying to fall asleep driving. My whole body is messed up (digestive system, immune system, etc). I'm really depressed. I've lost almost 10 pounds from stress (which I'm very thin to begin with) I can go on and on. I have 2 children 6 and almost 2 and a husband who works days. My husband HATES my job and begs me to find a day job all the time. I feel like I can't even enjoy the time I do have with my family because I'm always so tired. It's killing me because I don't know what to do. I like this job but just not night shift. I have looked at numerous other hospitals in my area and there are no day openings in OB..only nights. Any advice?? Should I try to find something different?? At times I just feel I am sacrificing too much for this job...my health, quality time with my children, my marriage...my sanity. Please help :(