lactose intolerant

So I found out after my first baby I was lactose intolerant. Never went to a dr for it. But every time I drank milk or ate cheese it made me sick, gassy, etc. So here lately I've been trying to drink the real milk that's lactose free and I just can't do it. I have to stick with soy or almond milk. The lactose free milk makes me run to the bathroom after a few bites. Does anyone know what could cause this? Perhaps an allergy to milk rather than lactose intolerance?