Suggest Remedy For Chronic Diarrhea During Pregnancy

Hi, I am 18W 5D pregnant and for about 3weeks now I ve had bad diarrhea (about 1-3 bathroom trips an hour) it is yellow in color with white mucus. It seems anything and everything I eat or drinks goes right through me, if not through me then it just comes right back up.. I ve also been very nauseous and finding it hard to stay hydrated. I ve also been experiencing cramping in my abdomen but that kinda to be expected with how active my digestive tract has been. Anyways I guess my question is, has anyone else had this issue? Is it normal? ( this is my third pregnancy and the first time I ve experienced this) could this be a sign of something more serious?!..