Your symptoms may be indicative of Tourette syndrome. Tourette syndrome is a nervous system disorder that often begins in childhood between the ages of seven and 10 years old. It affects males at a higher rate than females. Characteristics of this syndrome include repetitive, involuntary movements and vocalizations called tics.
The involuntary compulsion you feel to slap and bite yourself as well as shout obscenities are likely tics. There are two types of tics: simple and complex. Yours are probably of the complex variety. Tics tend to increase when an individual feels anxious or stressed but that is not true for everyone.
I agree with your assessment of self-harm and disassociation. Those are not fitting explanations. Your symptoms are not characteristic of an individual who purposefully harms him or herself. Your behaviors do not seem to be within your control.
I of course cannot officially diagnose you over the Internet. Based on information you provided you may have Tourette syndrome but it is important that you are evaluated by a mental health professional.
There are no specific tests that can be given to determine a Tourette diagnosis. Generally, a mental health professional relies on an individual’s personal history and current symptom levels to determine whether or not he or she is given a diagnosis of Tourette syndrome.
I would encourage you to read more about Tourette syndrome. The websites listed below are very informative. Many of the websites also describe treatments. Treatments include medication and psychotherapy.
The National Tourette Syndrome Association has an information and referral service. You can e-mail or call individuals from this association. They may be able to assist you in locating treatment professionals who specialize in treating Tourette syndrome. Here’s a direct link to http://tourette.org/. There you can find the contact information.
I hope this information helps to shed light on what you may be experiencing. What is very encouraging about your situation is that while your symptoms are bothersome, they are not overly affecting your life. Perhaps with the proper treatment you will be able to eliminate them entirely.
I wish you well in the future. Thanks for writing. Please take care.