Recently I've started to have a pain in my lower left abdomen. It doesn't hurt too bad, but when I sneeze it shoots pain. I've also had some odd bowel issues recently, including diarrhea and constipation. When I eat/drink it feels like it just sits in my stomach as opposed to being absorbed normally, and I have had heartburn every day for about a week (it feels like liquid in my stomach is just hanging out at the bottom of my trachea). I have been drinking a lot of water, but not really urinating much, although today I have urinated twice with a good volume, so I'm not sure if maybe I was dehydrated earlier. I am a 23 year old male, slightly overweight (5'10", 225 lbs but muscular) with no real previous medical history. I do have a sedentary job, and I don't get much exercise, plus my diet leaves much to be desired (too much fat/simple carbs/red meat) so I was thinking that could definitely be related. I don't have any nausea or other issues that I'm aware of. Any idea what might be wrong with me?