I had a SVT ablation 3 days ago. Since then I've had 3 migraines in lessening severity. Always starts in the left vision with spots or bolts then within 10-15 minutes a blinding headache and feelings of nausea. First time I ended up in the ER with a suspected blood clot. Heart group nurse never heard of it but found a few forums referencing it. I feel fine the rest of the time then in the early afternoon it comes on like a flash bulb light show and wipes me out for 3-4 hours.