I don't think there's any danger to fly, but you still may feel pretty beat. I was up and out on day 2, but spent it locally in my town and took it easy for a few days before returning to my normal routine.
The other thing you will no doubt have is a sore groin/upper leg. If you have a lot of walking to do around the airport terminals, this may be difficult for you. I limped around for about 2 weeks following mine. Go easy!
I've had 3 ablations and felt pretty good within a few days and certainly by a week. But I don't know how comfortable it would be to fly within 2 days. The groin area tends to bruise up pretty well (even though I'm female I wore boxers and loose pants) and it can be uncomfortable to sit for any length of time. Occasionally a person will develop a hematoma at the puncture site and that feels a bit worse.
Any way you can shift the flight to a few days later? Then again, if you're just going from UK to Germany, that's probably a quick trip. If it's less than 2 hours, it probably won't be any trouble.
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