Lactaid and expiration date

About eight to ten years ago i had a violent reaction to lactaid. I had taken it numerous time before with no problems and then I woke up one morning - had a bowl of cereal and a lactaid pill - within the hour I was experiencing severe stomach pain along with vomiting and diarrhea. I thought it might have been due to the fact that i had had very little to eat the day before and only a bowl of cereal that morning with the extra strength pill.

the following weekend i was brave enough to try it again with some ice cream at night (this time i had a full stomach from dinner). BIG mistake - this time it was worse - the stomach pain was out of this world (i have a high pain threshold but this had me in the fetal position) and i couldnt leave the toilet and trash can for a few hours. My girlfriend was scared and called one of those nurse hot lines. they told her to coat my stomach with some kaopectate - which seemed to help. I checked the bottle of lactaid - and the expiration date had passed - so i threw it away and swore off of lactaid pills. fortunately they came out with the lactaid milk!

Fast forward to now - never touched the stuff again. well the other day I was out of lactaid milk and my wife (yes the same girlfriend) had picked up some samples of lactaid pills at a trade show - so I guess with the passage of time - I forgot how painful and miserable the other experiences had been - so i took the pill. Nothing happened!

Last night i decide to take another one because i had a craving for ice cream (had been awhile!). I figured it was ok since i had no reaction a week ago. Well sure enough - within the hour I was on the floor in severe stomach pain - followed by vomiting and diarrhea. This time we had kaopectate in the house - so i started taking it - well i just threw it right back up.

This episode lasted about an hour and a half this time. There was a metallic taste in my mouth about the third time i vomited, and the fifth and final time, there was puddle of yellow liquid that came out at the end.