Worried, fast tracked for lower gastrointestional cancer

Hi I had blood tests last Tuesday and on Thursday got call from my doctor to say he has fast tracked me for lower gastrointestinal cancer 

I've been losing blood for over a year not every day thou I've got the worse heart burn and wake up choking on sick that just comes up while sleeping I'm badly bloated I could pass for being 9 months pregnant I'm 50 years old I've not really lost any weight that's what's making me think it can't be cancer ‍♀️

ment to say the blood results showed I'm badly anemic and my iron levels are 8ug/l 

xxx