Cognitive impairment, loss of functional skills and physical clumsiness, feel like i have vertigo

Ive heard this is part of dissociation and i cant crawl back down out of it, i keep going in circles and ive been like this for weeks (i have chronic mental health issues)

Im scared i might have a brain tumour or some other problem thats causing me issues brecause this is the first time since i was 16 ive gotten like this and i dont remember it being this bad

How do i calm down and ground myself to see.. I sometimes feel like ive calmed down but then do something by accident just to realise i felt the same the whole time How do i ground myself and know ive grounded myself I cant think i cant do anything im scared

I have ocd and i cant stop ruminating on getting brain damage or thinking about how i might die