Agree with the others, if you are truly miserable, it really does make sense to move back.
I was unhappy a lot of the time and I
really did try to give it a go but I never felt at home. I stayed for 4+ years and looking back, I should have made plans to return home after 2 yrs. My husband was for it because he wanted me to be happy but I kept thinking that I wanted to make it work (I kept questioning what was wrong, why couldn't I feel at home). Needless to say, I tried way too hard to make it right and it never was going to be so for me. After a while you just have to cut your losses and move on.
Make a decision and look forward to the future.