Freaked out ughh

I know this sounds crazy, but I just started fludrocortisone 0.1 nice daily and the lowered heart rate is freaking me out. My resting heart rate was always 85-100 sitting and standing was 130-150. Now it’s 73 sitting and maybe 110-120 standing. Still not great, but better than what it was. I just started yesterday so it’s going to take awhile to really work, but am I just in my head about this? Since starting my anxiety has been through the ROOF. It’s been so bad. I don’t think it’s the medicine it’s just mental. Why is me having a normal heart freaking me out so much!! Is this normal for this medicine? Lol