Feeling of having cancer all the time.

I am suffering from health issue from 9 months.i am tired of it now.i have gastritis,constipation,piles ,fatty liver,etc ..whenever i have pain near naval i feel that it is colon pain,and the tension starts ...i thought it to be cancer,and become uoset.i told my gastro doctor about it he said that your ct report is normal there is loaded colon only...but i cant understand the readon of this pain.the pain occurs daily .i am frustrated now of my health issue there is no one who can understand me...with whom i can talk openly.but wjen the pain is not there i have not any problem of tension.it depends upon my abdominal pain ..what do you think doctor is the pain is due to tension?kindly guide me..i lost hope in life now...