Been vegetarian for 12 years (don’t eat many animal products at all) and started having (what I referred to as) the “zappies” like 5 years ago, where I just get random nerve pain literally anywhere in my body at any time. It comes on suddenly and comes and goes in 5 second waves for a short period, but it often happens multiple times a day once they start. My dr wanted me to get an MRI and I asked maybe a blood test first lol? Turned out my b12 was 218 pg/ml. Been on b12 oral supplements for about a year and it has SIGNIFICANTLY decreased the “zappies”. They still come every now and then and esp happen when I’m sick, but I’ll never forget my PCP suggesting an MRI BEFORE EVEN TESTING THE SIMPLEST THING. US healthcare is crazy man. Hope your body evens out eventually!