Newbie here. Have had pacer 18 months. Have been complaining of short or breath for close to year. Always told pacer was ok. Yesterday was told after nuclear stress test that pacer was NOT working correctly. Got called to pacer clinic and had nurse and doctor reset some things, I got walked about quarter mile to see if breathing waz ok during that time. It was ok. So now today I'm on my own. We will see if it works. I sceptical because they reset it 5 months ago and breathing got worse.