I have paroxysmal AF and I've been on 60mg diltiazem twice a day since the new year. I've being having more headaches as a result, but I've noticed recently that they are becoming more severe and lasting longer. The headache I have now has been present since Sunday. It's mainly in the left hemisphere and moves from front to back. Paracetamol dulls it slightly, but it never goes completely. Is this something other people have experienced with diltiazem, or should I pop to my GP? Thanks in advance for your advice!