Dr. Tullio Simoncini. Also try Dr. Sircus.
Having fun means taking time out to do things you want to do. Quite often we don't even know what those might be and that's half the problem. Laughter particularly is vital —it oxygenises our bodies for a start. When I got my diagnosis I started watching an hour of comedy a day on YouTube. That was my most important medicine and it still is a very powerful part of my healing.
In a nutshell, you have to rediscover your reason for living. It is not your children or our family. They are a vital part of life but they are not your destiny.
If you don't know your purpose, and can't even imagine it, then pray to be told when you go to bed at night. Pray and then listen for the next 48 hours. The Holy Spirit will get a message through to you but you do have to listen.