I feel like something is drilling my forehead. heavy pressure inside my head, mostly on the back of the head. sometimes i feel like drops of water falling inside my head & a cool breeze flowing inside. what medical condition is this?

My sense is that you're experiencing scalp muscle contractiom symptoms caused by chronic stress & anxiety. If so, stress management therapy by a mental health professional would be helpful. For peace of mind you could consult a neurologist for evaluation and any testing deemed appropriate.

It sounds like ice pick headaches or primary stabbing headaches. Trying to find triggers for it may render possible culprits. Work with your doc in trying to clarify.