Thank you so very much! I know that if I googled "side effects" lactaid pills I would find the answers! This is worse than how I would have felt without taking the pill. I had a latte with 3 shots of espresso and within minutes I began experiencing nausea, headache with a very sour stomach, so I took Zantac. I feel like vomiting (but it won't come) and I will need to leave work early I feel so bad. I am done with that and wish I had not invested in a HUGE supply!