PPPD or just anxiety..?

Hello everyone!

I've always been an anxious person, but high functioning with panic attacks a couple of times a year. I don't take any meds except Xanax 2-3 times a year when I fly long haul.

For 6 years now I've been experiencing swaying sensations, but ONLY when I sit still and look stright (e.g. working at a computer, which is a daily thing). It doesn't happen when I sit and look at my phone or read with my head down. I don't experience any difficulties when moving ( including exercise and riding a bike) or driving a car/ being on a boat/ laying down. I'm a doctor myself so I did all kinds of tests, including an MRI+ angiography and every possible vestibular and balance test you can imagine- they all came back perfectly normal ( except 3 minor disc protrusions in cervical spine)

I was recently diagnosed with PPPD but I'm not sure my symptoms fit in there ( honestly that information worsened my anxiety) or it's just my neck muscles which have been incredibly stiff for decades..? Every time I get a massage, swaying sensations are gone for a few days.

Thank you!