Happened to me, took me three years to fully recover. After 2.5 years my blood test was FINALLY showing levels under the top of the range for B6 serum. At the worst I had full body muscle spasms that would go on 24/7, all the big and tiny muscles in my arms, face, legs. The worst however was I had esophageal spasms constantly which I confused for heart issues for the longest time. I completely lost feeling in my fingertips and toes. The list goes on.
It's actually pretty crazy, I tested recently because I was curious and for the first time since I completely stopped B6 I took a 10mg dose and that evening my muscle spasms came back, my nervous system is so whacked out from this. This experience is what turned me off from supplements, it's horrible.
In all though I had pretty much every symptom listed here: https://understandingb6toxicity.com/b6-toxicity/symptoms/
It's actually pretty crazy, I tested recently because I was curious and for the first time since I completely stopped B6 I took a 10mg dose and that evening my muscle spasms came back, my nervous system is so whacked out from this. This experience is what turned me off from supplements, it's horrible.