My hubby has been doing FIFO for about 6 years now. I didn't find it as hard back when we had no children. I kept busy with work and friends. Now we have 2 children, and for me it's definitely more challenging now. Our eldest is 2.5 and youngest is 1.5, and some hitches I feel like I cannot cope with FIFO anymore and wish hubby would be walking in the door of an evening. We are very lucky that he is on an even time roster (3 weeks on 3 weeks off), so we get a good chunk of time with him at home. The family time we have together and the fact that I can continue to be a SAHM makes it really worthwhile for us. Yes I miss him, yes some days it's hard, but when we weigh it up, FIFO works for our family much better than if hubby was working close to home. My hubby loves his job (despite having to be away from us) and went into FIFO as a career change and not just a way for us to get ahead money wise.
I guess what I'm trying to say is that only you and your partner know if FIFO is really for you and your family. It can take awhile to adjust to it though, so maybe you need to give it a bit more time?