Get well soon, Steph!
What's the name of the condition he has?
Get well soon Licht
It's a benign cardiac arrhythmia (atrial flutter), which is a type of tachycardia. I am certainly no expert, but I read it's basically down to irregular electrical signalling in the atria. Heart rate feels elevated, you get lightheaded, feel faint, need to sit down, focus on breathing, etc. One can semi black out if they're exerting themselves... well, you kind of see black spots, at least. Some athletes go through this ablation surgery, and occasionally have to have the procedure repeated. Jonas Gustavsson (NHL back up goaltender) once had 3 ablation procedures in 16 months, I'm pretty sure that was for a flutter. That was in 2011, and he's still in the league now (barely, although goaltending isn't exactly running up and down the pitch for 90).
Good it's not atrial fibrillation, which is a different and common type of tachycardia, and what I thought he was diagnosed with at first. Rich Peverley (hockey, again) had this, the Dallas Stars treated him preseason, and then 3/4 of the way through the year he almost died on the bench after going into cardiac arrest. Not to alarm anyone, different condition and I think there may have been some weird interaction with some meds they had him on, also. Anyway, Pevs heart stopped, but the EMS were on the scene in literally 15 seconds or so, and saved his life. That was some scary shit, but not the same as this situation.