Sudden bp low, chest pain. My health.

Sir, I am a diabetic and htn patient for the last 1 year. Taking diabetes pill vildamac 50/500 and glucreta m 10/500 single time and my blood pressure always range 140/90 to 160/90 after taking metoprolol 50 and talmisartan 40, 2 times a day for the last one year. Now for the last 7 days my blood pressure suddenly comes to low, avarage of 100/60 in morning when i get up from bed and it becomes fluctuate between 100/60 to 130/80 ,some times 110/72, for the last seven days with out taking bp medicine for last seven days. Sometimes I feel pain in chest where I go through ECG and echo yesterday. And my feet and palm only sweating a lot and cold. What is the reason for suddenly drop of my bp with out medicine from last 7 days and what should I do...and which test i ll do further. Please help me as I am so anxious right now for my health. Thanks