Have Pressure In Back Of Head. Get Dizzy, Noise In Ear And Crackling Sound From Neck. On Birth Control

For 9 months now I've been having this weird sensation in the back of my head, no pain more like air pressure or fullness. Whatever it is, is making me feel not completely here. I feel like I'm in a daze & it is constant until I fall asleep. Sometimes I get dizzy (no spinning) where my head feels too heavy for my neck. I've noticed noise in my left ear & I hear a lot of cracking and clicking from the upper portion of my neck or base of skull. Please help me I've been to 7 doctors including specialists and the only diagnose I've gotten is tension head which I completed physical therapy & felt no change at all. I'm only 26 & healthy, I take one a day vitamin and birth control.