I am 42 , male , got colonoscopy done in Oct'12 , normal except some step formation in colon, Dr advised fibre food etc, since last 3-4 months have lost around 3-4 kgs. Have had constipation problem since long , this aggrevated during Feb'13 last week which led to waekness and feeling of shrinking. Vit D low at 4 , Vit B12 low at 259 . Had piles,fissure in March'13 , bleeding now stopped but pain and burning persist , also gas and feeling of bloating. Advise pl