If it helps...I did have a full on head tremor 15 years ago which started mildly ,more of an annoyance than anything..I went along to get it checked out with Parkinsons in my mind as a possibility..I wasn't particularly hyped up about it as I didn't suffer HA back then.. My GP checked me over...also my neck/spine was checked.. The tremor became m,ore pronounced..I had no other signs of Parkinsons going on at all.. Was sent to physio for 6 sessions...and ...tremor gone...It was from severe tension in my neck muscles..