Thanks to everyone who responded to my message yesterday (side effects of pacemakers). The responses are reassuring! I'm sorry to have caused anyone unnecessary anxiety. At the end of the day, most of us here are alive/functioning better because of these devices and I wouldn't want to put anyone off having one on the basis of 'hearsay'.
This site is always a great resource for information that is not always easy to find elsewhere, and Im really grateful to you all for your time.
Best wishes to everyone