Hate the layers

I usually get trims every 3-6 months by my husband and my hair has grown so so much. Before I went to the salon and my hair was to my butt and then I got a “trim” and afterwards it was shoulder length. Ever since then I’ve been so scared to visit a salon again. I decided to go today to get a trim and asked for long layers but not too many. He said my hair was healthy and wouldn’t cut too much and make the layers long. He made way too many short layers and now the long pieces of my hair at the bottom are so so thin. 😭 how long will it take for these layers to grow out?? Any advice for trimming hair at home with layers? I hate my hair. It was thick before and now feels so thin. He said I thought you would like that it feels less heavy? I liked that about my hair and how it was easier for me to style.