Positive Q fit test - 400

Hi all, 

im really worried, im 42 years old and have been having Diarrhoea for around 4 weeks now. I got my Q fit result back from doctor and its 400, she has done an urgent referral. 
i am experiencing major cramps, im back and forward at the toilet all day long as it is just flying from me. 
i am so worried. Im exhausted feeling drained and dehydrated all the time. 
Has anyone had similar? If so.. what did it end up being? 
cancer or IBD 

any advice would be great, im just sat waiting on a hospital appointment.