Lately, it seems, I wake up tired. Not because I’ve been out carousing half the night or digging ditches all day long. Nope. No obvious reason, except for one: I’m in AFib. Again. Here’s a life tip: When your EKG looks more like a stock market chart than a recording of your heart’s electrical activity, you might have a problem. As in, an irregular heart rhythm — and often very fast — heart rate. That’s atrial fibrillation. I’ve seen this movie before. Back in 2017, I was in full-blown AFib with no symptoms except for a “resting” heart rate of 130. I got my mitral valve repaired and was good to…