When i run about 2 miles, i feel pain in my right ear. what is the problem ? i have e feeling that there is too much pressure inside my head!

You may be right: If you're right about the "too much pressure" it's probably confined to the right middle ear compartment. Could just as easily be too little pressure there. If you've had head congestion, you might try some allergy medicine or just wait a week or two for the congestion to clear, so the ear pressure can return to normal. If needed go to either a primary care or ENT provider.