“After the lost cup match against Union I was angry and frustrated,” Alderweireld told Belgian media outlet VRT (h/t Sporza). "I couldn't sleep that night and went to the club early the next morning to do a strength session. Before I left, I took a caffeine pill because I don't like coffee.
"When I was in the car, my heart suddenly started beating at a rate of a thousand an hour. I thought: I'm going to have a heart attack. I'm done for, I'm never going to see my children again. I pulled over, walked into a furniture store and asked if they could call 911.
"It turned out that all the stress made my heart pound. That gave me a panic attack, which made my heart beat even faster. You actually drive yourself crazy. And at a certain point you think you're going to have a heart attack and die.
"We did a lot of tests, but everything was okay. Then I started talking to people and they said it was due to too much stress. Purely a panic attack. Now I still suffer from that sometimes, but I can accept that because I know it's nothing.
"That's why I quit the national team. I had a great time there with five major tournaments and was able to close that chapter."