Seeking advice and tips

I'm 5 months PP. I am starting to feel moody and resentment towards my husband. I am a first time mom, it's been a journey for my son, he has mild eczema since he was 1 month. I am consistently fighting to find a way to help him be at ease while my husband what seems to me he says, live his normal life before my son. I am frustrated because I feel that I'm giving my all and he shows little interest to helping my son with his eczema. He has other priorities and needs to have at least 2-3 days to do that. This was my husband routine before baby. I'm now feeling resentment because I don't get days to myself anymore. I don't have a hobby like him and it bothers me that he doesn't understand how I feel. We are fighting more at night due to my son battling with eczema, it makes us all fussy / cranky and up at night consistently. Please tell me how do you cope with time away from your baby and partner. What helps you? Also, if your fighting eczema what helped your baby? We tried so much already. (Vaseline, Aquaphor, Vanicream, Aveeno, 1% hydrocortisone, and prescribed 2.5% hydrocortisone)