Hi Ant
I found this information about indapamide:
"If you experience any of the following symptoms while taking this medicine you should inform your doctor promptly, so that the amount of fluids and salts in your body can be checked: thirst, lethargy, confusion, weakness, drowsiness, muscle cramps, scanty production of urine, abnormal heart rhythm, seizures, nausea and vomiting."
It sounds as if you should be talking to your healthcare professional about the issue you are having.
Hope this helps
Doug