2 elevated B12 readings. Second higher at 1100. Stopped taking vitamins per doctor. No energy drinks. Should I be concerned that it didn't go down?

No need to worry. There is absolutely no need to be concerned about high B12 levels. This simply means you have more B12 in your blood than average but this is not a problem. There is no known toxicity from B12 ; no need or reason to stop taking vitamins. However, i'm not a big fan of "energy drinks" as they tend to be high in sugars or, even worse, artificial sweeteners. Consider herbs like ashwagandha ; rhodiola.