Advice!!

I had my first child at 16, I met my husband when my son was 1. He has been there for us ever since and now we have our own daughter together. Lately my son has been in trouble at school and I have tried Everything, I don't know what to do anymore. I found out he has ADHD but I don't know how I fee about medication. So my husband is very tough on him but sometimes he over reacts and he lets our daughter do almost what ever she wants. We just got into an argument about it and I don't feel good about things he said...