I Had Open Heart Surgery March 5th 2018 And Have

I had open heart surgery March 5th 2018 and have rehabbed excellently. Other than erratic sleep still somewhat bothering I have just noticed my fingernails are getting horizontal duvets on each finger. I have taking some Furosemie 20mg OTD for the passed week. No potassium supplement being taken with the Lasics. I have arthritis in my hip causing some pain and I have taken two Arthritis Tylenol 12hrs as needed.