I've Been Suffering For This Constipation For A Long Time

I've been suffering for this constipation for a long time it's about 8 months now . And I'm losing weight which I don't know why bought the well basically one of the reason I know is that the 14th ache because I am suffering us well for my gas pain every time I am eating or biting something for meI started to do those appetite because the gas pain is SevereI felt like there's I felt like that there's blood running that Theres a blood inside of my belly from my digestive system. . I also suffering from an Eric or are you in deficiency and cramps at night I excessively disposing alee that little tiny round pinkish dark we the little bit off blood in my stool. It's like a goat's.this is a very irregular will stoop to me I never experienced this before do you suggest that I go for colonoscopy.?