I am glad that you wrote. While I cannot officially diagnose an individual over the Internet I believe that the symptoms you have described are characteristic of obsessive-compulsive disorder (OCD). I have listed the specific symptoms below.
- Cannot look at certain colors
- Obsessed with the number five
- Having obsessive thoughts to the point where they were negatively affecting your school work
- Your new fears associated with natural disasters and atomic bombs
You may have a mild form of the disorder. The trigger for the illness may have originated in third grade when your sister became ill from drinking tainted water. That incident may have caused your problems.
Please keep in mind that I cannot know with certainty if you have OCD. It would be best to attend an in-person evaluation with a mental health professional. He or she could review your symptoms in more depth and then determine if you have OCD. Please speak to your parents about this. If you are able to get help soon then you may be able to stop the symptoms from progressing.
The next step for you is to speak to your parents again. Let them know about the letter you have written. You could also show them my response. The purpose of speaking to your parents is to let them know that treatment is warranted and that you may have OCD. It’s also important to inform your parents that OCD is a very treatable illness and that the sooner it is treated the better. OCD can be a progressive disorder; the longer that one avoids treatment the longer it may take to treat the disorder.
Many people are helped with psychotherapy and some utilize medication. Some use a combination of psychotherapy and medication. Cognitive behavioral therapy has been found to be very effective for OCD. For specific types of OCD, behavioral treatment or hypnosis is recommended.
I hope you’re able to speak to your parents and get the help you need. Keep in mind that you are doing a very brave thing by proactively trying to treat a possible illness. You may find that with treatment, you can be cured. Please consider writing back to let me know how you’re doing. Thank you for your question.