I have recently had rectal bleeding which was no stool just blood and mucus and it was like I had diarrhoea but it was blood - this lasted 4-5 days. A&e sent me home and told me to get the samples into GP. The reg sent me home because I was on my period and said this could be linked however I have had normal periods for 18 years, not heavy and never had rectal bleeding. PR exam was normal, the advanced nurse practitioner took me in another room and reassured me that she doesn’t believe it is this and to please follow it up and come back asap if I feel worse. My period finished the next day. 
Bloods came back okay just low iron, ferritin of 8.
I did a FIT sample and Faecal Calprotectin
Fit sample - Result of 98
Faecal Calprotecin- Result of 6000 received today.
(These samples was taken when I couldn’t see any visible blood)

I’m on a 2ww because of the fit test and now I’ve received the faecal calprotectin.

I have severe stomach cramps, bowel habits have changed the last two months. I am constipated for 5-7 days and then will have diarrhoea and then constipated again.

Any ideas on what this could be as I am going out of my mind!