Thank you for your query at DoctorSpring.com.
I have gone through your history and picture attached. From the data available your father has probably atrial fibrillation with intermittent slow and fast ventricular rates. The pacemaker treats the slow rate but drugs like amiodarone or beta blocker may be required to treat the fast rate. Your father probably suffered from postural hypotension in which bp fell excessively secondary to anti hypertensive medications. And so they were stopped most likely.
Was the pacemaker interrogated or checked when he had that fainting type of episode?
Was the pacemaker functioning properly during that interrogation?
Was your father on drugs that increase urine output?
Has your father undergone an echo examination?
If yes what was his ejection fraction?
Has your father undergone renal functional tests?
If yes what is his creatinine?
What is his hemoglobin if you have tested it?
Is the swelling painful?
Pedal edema in both feet could be due to cardiac renal liver causes and severe anemia. If the urine output is normal then the other causes are not a dire emergency but need to be investigated.
If the urine output is normal then you could restrict his fluids to around 1.3 litres per day and salts to 2 g per day so as to reduce the edema.
Limb elevation will also help
Hope this helps, please feel free to discuss further
Dr Vivek Mahajan