Can A Diuretic Be Taken With Coversyl?

good morning my age is 55 overweight around 110 kilos, female. i have tacycardia and high blood pressure i was on concor 5 plus 1 tablet a day. lately my blood pressure started getting lower at night reaching 9/4. i saw a cardiologist , it was shooting up 15/9, so he prescribed concor 2.5 and 1 conversyl at night. but i could not urinate so i started taking concor 5 plus half a tablet. now i have to rebuy, my cardio is out of town, should i take coversyl and concor 5 plus (1/2 a tablet)? i am worried that a diuretic is not good with coversyl. my pulse is in the 80 range, my blood pressure is 14/7 in the morning , after food and work and of course some salt it is 15/ 8 in the evening. tks