Frequent urination, dark urine and a burning sensation together usually point to a urinary tract infection, and the heavy feeling in your lower belly fits that too. This commonly needs a short course of antibiotics, which only a doctor can prescribe after confirming it.
Next Steps
Get a urine routine and culture test done today, and see a gynaecologist or physician so treatment can start while the report comes in. Drink plenty of water through the day and avoid holding your urine.
Health Tips
See a doctor urgently if you develop fever, chills, or pain in your back or sides, since that can mean the infection has reached your kidneys.