Mirtazapine weaning off 15mg after 1 month

so i’ve been on 15mg on mirtazapine for my anxiety and panic disorder, a month now and it’s causing very rapid heart rate, the first week of taking it was hell then i was okay until this week and it’s actually the lowest i’ve ever been. i called the doctor and he told me to take 15mg every 2 days for a week then 15mg every 3 days for week then stop, after reading every google doc and scaring myself and worried about the withdrawal symptoms i’m not sure if that’s how i should taper off them.

i know i’m not on them for that long but has anyone been in this situation or have any tips on how to wean off them or should i just listen to the doctor and do the 15mg every 2 days then every 3 days…?