Diarrhea and junk food?

For the past 1 1/2 weeks, I have been having diarrhea. It started 10 days ago, I used the restroom and it was completely watery diarrhea. My Bowel movements have been weird. I used to go to the restroom 2-3 times a day, but now I go once every few days. 2 Days ago I went and it was fairly normal still soft though. Today is the first time I've went in a few days, and It was fine for a couple seconds, than turned into watery diarrhea again! Tonight, I've eaten 3 little bags of cookies, 6 mcdonalds chicken nuggets, some fries, and a fruit pop, and some Quaker treats. Please someone help me I am going on vacation in a few days and want to feel better.