For The Last Year I Have Suffered From A Motion

For the last year I have suffered from a motion feeling like I'm on a boat. My head, right under my scalp feels tight and it crunches when I move my head and pops when I move side to side. I have been experiencing pain all over my body and swelling in my ankles and arm right above my wrist. My doctor has performed numerous test that revealed nothing. My pain is so bad. My head is so crunchy when I apply pressure to it and move my head around. What could this be?