Since last two days, I am feeling unusual feelings in the head. I can not describe it properly. It started with a feeling of dizziness with mild nausea, unsteadiness then restlessness, extreme stressed, the pressure to the centre around the head, cannot take or think anything freely, perspiration in the body, nervousness, headache, can not relax. My bp was 100/76 on the day before yesterday. These are creating extreme panic on me. What is going on exactly? Is it a physical or psychological problem? What to do? Please help.