Am i going to die soon? Neuro conditi!

37M. I was fine until ~50 days ago. Since then I have intermittent head heaviness/fogginess, needing extra effort to concentrate/work, mild dizziness and a feeling that my head/body is not fully focused. I get random brief pin-prick pains in different scalp/head areas and occasional brief zap/electric sensations; these are now less frequent. I also have heaviness/tightness at the back of my head and lower neck. At times I feel internal shaking without visible tremor. Occasionally I feel subjective leg heaviness and positional finger tingling, but I can walk, work, drive and perform daily activities without persistent weakness or falls. Symptoms often reduce when busy. I have anxiety about brain disease and am seeing a psychologist. Video neurological assessment was normal. Eye examination, including fundus/optic discs, was normal. B12 was 219 and Vitamin D 7 four months ago. Could this be anxiety/migraine, vitamin deficiency, cervical spine/neck-related, or another deadly neuro conditi