Lactose intolerant

Finally tried the enfamama chocolate milk. Taste good, i like the taste. But 2 hours later, it caused me to have soft stools. And it happened twice. I suspect that i am lactose intolerant. Are there any lactose free alternatives? I've called NUH O&G, the nurse said can try yogurt, cheese. If not calcium tablets as a worse case scenario. I have yet to try similac vanilla. #advicepls #pleasehelp