Here are few causes of uncontrolled BP while being on multiple medicines:
1. Salt intake more than
2. Excessive weight/obesity
3. Obstructive sleep apnea
(related to snoring
4. Poor quality medicine
5. Faulty BP machine giving wrong reading
6. Issues related to other organs like kidney
, adrenal gland etc.
7. Significant psychological stress
8. Taking lots of pain
.and many others
See if you can address all of these. You may need to see a cardiologist
if your BP still is high.