Please help, scared. Positive fit test 2ww

I've been having abdo issues for Around 18 months. The biggest symptom is a feeelong under my right ribcage. 
bht also gassy and noisy. 
 

I had a fit test a year ago and it was 5 

they redidit as my symptoms are ongoing and it's come back as 10 and I've been referred for colonoscopy. I'm terrified. I have 2 small children.