Lactose intolerant?

[Maura]

I have been really sick three times in the past couple of weeks and haven't figured out why yet. Symptoms include nausea, vomiting, diarraeah, stomach cramping, back pain, constipation. Noone else in my house has shown any signs of the sickness since the first time i was sick a couple weeks ago, so it is not an airborn thing, unless my kids and hubby have super immune systems. I was researching the symptoms on webmd.com and found that they line up somewhat with lactose intolerance. Is anyone lactose intolerant? Did you get sick like this?? I am at a loss for what to do. the symptoms come and leave in about 12-15 hours. but while i am sick i am doubled over and can't walk without feeling nauseous or vomitting.