Kayzee, I think you need to talk to your OH. My OH worked away a lot a few years ago. There was no regular pattern to his trips (he could arrive in the office at 8am and be immediately sent home to pack and catch a flight to anywhere in the world without any idea of when he'd be back). It was awkward for both of us but eventually we sat down and discussed how we felt as neither of us were happy with the situation (we couldn't make any long term arrangements, there was no routine and most of all he hated not being at home but put up with it to earn the wages - he didn't talk about it until it was clear neither of us was happy with the situation because he felt it wasn't fair leaving me with all the day to day household stuff plus worrying about him being unhappy). We decided the best thing was for my OH to change his job as our marriage and happiness was far more important than money in the bank (we're not so well off financially but are both much happier).
You really need to talk to your OH and also to listen to how he feels. I willingly changed my routine when my OH was at home because I had the luxury of plenty of time to do my own thing when he was away but he had no choice.
This may sound harsh but you mentioned that you've not decided if you can afford to move out. If you feel there's no relationship left is it fair to continue to rely on the financial support of someone you don't want a full relationship with? I think you've got a lot of questions that you both need to discuss...