If this is still an issue anon09 -
You might first scan your area for audio or video eavesdropping. Devices to do this can be found online and in various electronic catalogs for between $30. - $100. If you are being monitored, it is possible you are getting feedback, and hearing those who are monitoring you. I have thirty-five years combined in PSI/RV/Meditation training and experience. Check this out first before you spend greater amounts on medicine or psychological tests/therapy. Even psychics can cost more.