Lactose intolerant & waking up at 4am

I’m 19 years old and when I was little whole milk would make me bound. Now here I am 19 years later waking up in the middle of the night with (tmi) I know but diarrhea. I went to the doctors and without running any tests they diagnosed me with being lactose intolerant. Sometimes I have the stomach pains after dairy but sometimes it’s just the diarrhea. I’m wondering if any other ladies have had this issue so I can reassure myself this is what it is. On the other hand I’m wondering if anyone has any tips on how to fall back asleep at 4am because I’m running on fumes, and I cannot fall back asleep after waking up. Thank you so much in advance!💓