Sex life

So I'm struggling right now. I have a 18 month old, a small business, looking for a new house (because our current living situation also is stressful) my partner works full time. Our sex life is almost non existent and we promised ourselves that would never happen. But the thing is, I'm so tired I don't even have any sex drive I think. I love him so much and it hurts to think I could lose him... We are not all the same not everyone is capable of being super turned on or in the mood when so tired like we are. I always feel like I have to sacrifice something in my life to make something else work... (work less more sleep more sex or work more less sleep etc) And what hurts me also is that we would want another baby but we feel like we fail not being able to be intimate as often and that doesnt even makes us want another baby like planned. I guess I needed to vent.