Has anyone had stomach & esophagus burning after drinking SciFit Amino Infusion 5000?

I love the AI5000 but when I drink it, my stomach and esophagus burn for a few minutes. I have added water to dilute it and it diminishes somewhat. I just am at the point I can't drink the powders anymore. Also I have lost 95 pounds since January but am hitting a plateau now. I am trying to increase my protein intake but weight loss has definitely slowed down. Suggestions? Especially as they regard liquid protein?? Thanks for your help! Melanie

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