Lord have mercy.
Many years ago I also had a miscarriage, so I can understand your need to mourn and to heal.
About healing .... read the labels on all hair and body care products before buying or using them. Commercial hair care products can possibly kill you and an unborn child. Read the labels. Almost all are loaded with chemicals in them. If you cannot pronounce it, it is probably not good for you or your children.
When I took several courses in early childhood education, our professors were convinced that our modern processed foods, commercialized body care products with all their chemicals, and the increasing number of vaccines were causing an increase in miscarriages, birth defects, and auto immune diseases in moms and in their children. These professors also suggested that autism and other childhood diseases were caused by our modern love affair with chemicals and drugs. Consider that GRAS (Generally Regarded as Safe) ingredients are not even tested for safety, yet GRAS ingredients are found in our foods, our body care products, our health supplements, and even in our medications.
By the way, my doctor told me to wash my hair only once every two weeks, or even better only once a month. It was difficult to follow his advice at first, but I am glad that I did.
Currently I wash my hair by pouring a solution of one quart of warm water + 1/3 cup of baking soda. I scrub my hair while pouring this solution over my hair and I do this two times. Each time I towel dry my hair. Then I rinse my hair with warm water, and immediately follow that with a rinse of one quart of warm water + 1/4 cup of organic apple cider vinegar. Again, I towel dry my hair, gently. If my scalp and hair feels too dry and is difficult to manage, I add a drop or two of argan oil (longer hair needs at least two drops). This softens my hair, gives it body, and gives it a nice shine too.
Know that I will pray for you, your husband, and your mother-in-law.