Here I go again complaining about my job.

I should be thankful to have a job and I am. I am just tired of the stress, the work overload, the threats. Nobody is really happy in my workplace and most of us are actively searching for other jobs.
I am going to start applying for jobs again. This may sound bad to some people but I would like to get out of the medical doctor's office scene and do something different. I am thinking about a retail store job. Someone said that would be a bad idea. Another problem I have is that I have training in some things but I made a stupid mistake by letting my LPN license expire. My plan was to go to school to study bookkeeping and accounting but every time I was ready to go back to school something happened to mess that up. My current job has me working 50 to 60 hours a week. When I am not working I am too tired to do anything.
I love history and have thought I might like to work in a museum. I live in a historical town.
Today one of the girls gave her two weeks notice. She is actually going to work for the doctor who is my medical doctor. The Junior manager said something very mean to this girl and she started to cry. That is another thing. I am tired of the stress and bullying in this office. I was so upset on this girl's behalf. I gave her a hug. What is the point in being mean to people? I feel like our new office manager encourages bullying, but that might just be my sensitive, depressive personality seeing this.
I am not a bad person. I also like helping others. I love my patients. I just want some happiness and peace. Is that wrong? I feel so overwhelmed, stressed, confused and stuck. I know this is a long post. Any comments or suggestions would be welcome.