How would you handle this?

I am a stay at home mother of three children. My husband assumes that this is an easy job and all I do at home is do nothing. I have longggg days and I sometimes just lose it. I love being a mom so much but some days are hard and emotionally draining. When I tell my husband how I feel, his response always is “is it not your mates that are single mothers?”. In essence he implies that I have no reason to complain when some women do everything singlehandedly by themselves. If your husband says this to you, how would you handle it?