From what people have already stated on this thread you must experience at least 4 physical negative experiences like nausea, dizziness, numbness, fast heart rate, shaking, vomiting, upset stomach, diarrhea, hives, racing thoughts, derealisation, seeing things in the corner of your eye that are not actually there, light and noise sensitivity, etc etc. It is great to know that you are not suffering from these :. However you should talk with your doctor about your feelings. I wish you all the best. I would disagree with the people that state that they never last over a day - I have experienced them for periods of up to a week, only being able to stop them by going to the hospital and being completely knocked out with drugs.