FIT test over 400

Hi I am a 35 female, went into doctors about 3 weeks ago as I had a fever and lower back pain i put it down to a kidney infection had one bought of diarrhoea and then went back to normal. I did my FITT test one was lost at the hospital so I had to do another and I got a result of over 400. I have been back to the drs today and he made a referral and before I even got home I had a call from hospital to say that they had booked me a telephone appointment for tomorrow morning. I have anxiety depression and PTSD and now im in a right panic I cannot seem to calm myself down none of my grounding excercises are helping has anyone been in the same situation and everything been fine after your colonoscopy

Thanks