I'm no expert but your conditions sounds like it could be mulitple things. Many many disorders are linked with OCD.

You mentioned that you might contact your GP and see if they would have you put in a mental institution. That might be a little extreme. You could try contacting them and ask if they can refer you to a Therapist or Phycologist so you can get answers.

Also, don't worry about getting help shaming your parents. You are an adult now and they would be happy to see you get help and lead a productive life.

I hope everything gets better for you.