I agree with mini. Did you possibly switch a food or drink recently? Or switch an ejuice? Did you catch a bug? Are you becoming dairy intolerant? (It happened to me in my 20s, my slow descent into a non-dairy life). Look at all possibilities. Try Immodium to stop the runs, and Zantac 75 to stop all other bellyache issues. But not at the same time.
Good luck!