Why I fil pain in eyes deep inside sometime?

It all depends. Deep, aching pain in the eyes can either be referred pain from around the eyes (atypical tension headaches), inflammation in the eyes, or even dry eyes. It is difficult to diagnose the cause of your pain without evaluationg you. If this persists, please see an eye doctor.
Possibly sinus. The most common causes of deeper pain in the eyes include sinusitis and headaches. You should also have your eye pressure checked by an ophthalmologist.