Yes. But when you say diagnosed, by a doctor? If so, what did your doctor recommend doing about it, if anything? Was it a severe deficiency or a tiny one? Were you tested more than once -- we can vary by the day, the hour, the week, etc. in our levels. Your symptoms match a B12 deficiency. Are you a vegetarian or vegan? There's almost no B12 in non-animal food. I guess my main question still is, you were diagnosed, which means you got a blood test I assume, and I assume also this means you have a doctor. So again, what was recommended? Because if the deficiency was severe, two things should have happened: one, you should have been given a B12 supplement by injection as a start, and you should have been tested for a genetic problem that can cause some people to be unable to absorb certain B vitamins. Whether it's a serious concern is if it's a chronic condition, which can only really be known by more than just one test. That would show it's a chronic problem, not just one low day. Most docs don't do that, but you can ask. But your symptoms would match a chronic B12 deficiency. So would a lot of other things.