Challenge with mother-in-law

I have had a specific challenge with sleep of my son. He wakes up more than 5 times on many nights and has been the same since he was born. I do all the nights and also do a part-time job during the day. My mother-in-law keeps telling me that this happens to other kids as well. Whenever my husband does night duty once he gets a migraine. I don’t complain having done the nights by myself without help. I get mad when my mother-in-law says this happens with others as well and every parent has done this for their kids. Moreover, my husband doesn’t empathize with me and says I exaggerate things. I’m mad at both of them since they don’t believe me and don’t even bother to help or care for me after a sleepless night. How do I deal with this?