How Long Should I Be Off My Warfarinbefore My Symptoms

how long should I be off my Warfarinbefore My symptoms only appear for part of a 3 mile 4 mphan angiogram and possible stent(s)? I have had an AV node procedure with pacemaker placement.This was for severe atrial fib not treatable otherwise. I am 70 years and active .The last 4 to 6 months I get throat burning, pain below the pacemaker and have take 2 Nitroglycerine tablets in the past two weeks. My symptoms have recently increased and during brisk 4 mph walking and only for about half of the 3 mile walks 5 days per week.Sorry about the top.I will have an angiogram with possible stents on the 7th of Sept.