In March of this year I had my first ever afib attack. My cardiologist put me on 240 mg of diltiazem ER. I’ve been taking it since. Up till recently my only side effect seemed to be constipation. About three weeks ago I started experiencing a daily headache that feels like a lot of pressure on the top of my head. It’s daily but it comes and goes. My cardiologist said to stop taking the diltiazem and see what happens. I’ve been off of it for about five days but I’m still dealing with these headaches. My primary said that the headaches could last up to two weeks if they were being caused by the diltiazem. Has anyone else dealt with something similar?