[I feel like I'm walking around with a bowling bowl on my head and it's so bad all I can do is lie down. I'm going into a huge depression over this as most of my other symptoms, vestibular, dizziness etc are finally ]

Did a dr mention the cranial pressure aspect??
Possibly could be injured/spamsed neck muscles?
Head can weigh 8-14 lbs-- that is a lot if not balanced on spine - and if neck muscles are a issue..
Have you had any expert PT assessment for neck muscle injury and trigger points?