Upset stomach

Out of the blue I got a really bad stomach ache, it will go from dull to sharp pains to very nauseous and tmi I am in the bathroom more than regular due to some 💩. I’m not pregnant or about to start my period. I just need some tips or tricks to help get this stomach thing out of my body!! I’m seriously a wimp when it comes to stomach sicknesses any advice would be much appreciated:)