How to stay afloat

So my husband and I have different work schedules now since July 2016. I work 12 hr shifts 8a-8p and he goes in abt 430pm and off at 3am. We go 2-4 days without seeing each other. I have 2 kids which are his step kids so time is always with them and we dont get date nights or anything. We barley have sex because of this. I feel like I'm falling apart and feel like we aren't a couple I tell him and he doesn't think much of it. Does anyone have advice or go through same issues?

Thank ya