I get pain in my waist and lower back, not in the centre when I wake in morning it will remain for some time and happens sometimes from last four months. I gained weight from last 6 months around 4 kgs. I am not able to decide that this pain is from weight gain or ulcer or from sleep apnea or else something. One thing to tell you I am suffering from sleep apnea and I gone through surgery in my mouth for removing excess tissues before two years.