Is this related to gastrointestinal?

Hello Sir/Mam, So from last two days I was feeling very discomfort in my abdominal area! I feel like my kidneys are damaged! Because there was a change in how much I urinate ( less ) ! Colour of my urine is darker! I was not properly having motion (poop) ! Also I feel loss of appetite! But then yesterday evening I visited hospital, doctor examined me! And said it is something intestinal! And gave me these tablet's ( PAN-D, Meftal Spas, & O2 tablet )!! 2 times a day for 3 days!!  Also told me to drink enough water! So I took yesterday nights dose and it does feel little comfortable! But my urine was even darker this morning also didn't have enough motion (poop) But I am concerned that because I read on Google that Less urinating and darker in colour has something to do with Kidney Problem! So do I need to worry?