I recently had a pacemaker implant to correct slow heart beat and pac - heart rate now up from 50 to 85 - also had cardio ablation therapy for A-fib. I continue with flecainide and metaprolol. I am 75 and since the implant I have become extremely intolerant to heat; only a few minutes in 85+ temp and I begin to sweat profusely and my blood pressure goes down (105/60) is typical I feel faint and have almost blacked out two or three time a day when in mild heat. any suggestions?