A gentleman I work for has a pacemaker. He is changing some of the electronics he uses (not welders) and his cardio doc is having him wear some type of recording device for a few days to determine if the new electronic devices constitute a hazard to his pacemaker.
I really understand you not wanting to give up welding, but better that than you life!
I would strongly suggest that you ask both the doc & the pacemaker manufacturer for specifics regarding both the risks and the possible solutions. The ". . . it shouldn't be a problem . . ." answer is probably not good enough where your life is concerned. The technician in me would demand a firm YES or NO.