I Am Having Mild Pain In Lower Abdomen Along With

I am having mild pain in lower abdomen along with chills inbetween. There is no fever and stools were also normal this morning. Pain has been consistent for last 5 days and am also feeling lethargic. My vit d levels were recently checked and it was quite low(7.8). Am on 60k iu vit d3 supplement for last 3 weeks too. Is this a regular stomach flu which should get better soon or something else. I had a severe bout of stomach infection 2 months back and was prescribed Taxim 200 for 5 days.