I have severe lactose intolerance and Lactaid helped me immensely...

I have severe lactose intolerance and Lactaid helped me immensely for about a month. I was able to eat anything I wanted and felt great afterwards. Well, recently I've been having episodes where I've been sick to my stomach, doubled over in pain, etc. I didn't know what the problem was. There was no vomiting but a very, very sore and sick stomach. Tonight, it clicked that it was the Lactaid. So I took it again with dinner and here I am right now, 7 hours later, sick to my stomach for the past 4 hours. I feel like I need to vomit and the feeling is taking forever to pass. It's terrible. I will never EVER take this stuff again.