how do you move on?

There was so much arguing about who was invited after we had agreed on certain people. His mum felt her friends should have priority over mine. My husband is an only child and I tried so hard to include her in the fun stuff and she threw in my face how I'm not her daughter so why does she need to come wedding dress shopping etc. His mum saw a picture of me in my wedding dress and said how she didn't like it at all, she later saw me in the dress face to face and made it clear she didn't like it, I felt so ugly and selfconcious on my wedding day. In an argument MIL brought up my grandad who had passed away, I was truly heartbroken he couldn't be there. No one had ever argued with his mum and when I stuck up for myself without shouting she blew up and went crazy. She said I'm not caring at all and am in totally the wrong job etc, there was so much upset caused, I also found out her and DIL hadnt liked me for a long time 🙄. It was a huge mess. MIL also said she was going to have a party at her house AT THE SAME TIME as our wedding evening party for those who couldn't make it, she was planning to just take half of our guests with her!!! When we obviously said no she told us it was okay because she would give us the money that we would lose 😱. 

We agreed to put it all past us and it's been okayish since but deep down I'm still upset about it all and can't seem to move on. There was a lot more to it than just that and I was going into work upset, it caused so much stress leading up to the big day. I find it doesn't take much for me to feel annoyed at them for things, I don't want to be like this but can't seem to get past it. Has anyone else been through similar and managed to fix it?