780mg of Caffeine yesterday of Starbucks

Yesterday morning had 3 Starbucks 2x K Pod 8 ounce which is approximately 260/cup. So around 780 mg caffeine. Yikes. Had lots of energy and did not feel well. Just woke up after not sleeping really at all. No surpise. If you ever want to try a very scary supplement, it's beyond lit raw powder. Something in it is allergic. Any thoughts?