how to get hubby into sex/kids?

I feel like my husband makes excuses for not being able to have sex and/or doing sperm analysis etc. his excuses for not having sex much is his esophageal motility disorder and excuse for not doing sperm analysis is no gas to get there etc. But after 2 miscarriages and my age I'm afraid of losing my chances of having kids. But maybe I'm just annoyed that he has excuse for everything I ask him to do etc. Can having dirty litterbox cause miscarriage? my mil thinks so but I'm not supposed to change it if I want kids, but I can't get my husband to do it in a good amount of time so do I need to get rid of cats since he's unwilling to help in a timely manner or do I just do everything myself? I'm emotional cuz dr raised my dosage of meds for my anxiety and depression and having my husband not feeling well enough to help me at home. whenever he's not feeling well he's lazy but if I'm sick I still do laundry for him and do things when he asks, I don't make him wait until later etc. Unfortunately he learned his attitude from his stepmother and his "later" from his father. But I lost my mom 2 years ago and am still grieving cuz I miss her because we were close. she used to help me when I needed it and she never would have let us struggle so bad. my stepdad is the opposite he only cares about himself and who can help him. No wonder I miscarried maybe it's my stressful life. I wanted a kid to name after my mom and Grandpa (lost him this June). Am I crazy for wanting a baby before I turn 40 in 2 years?