Had a saddle embolism.
Developed after a bike crash which tore up my shoulder pretty badly. (Plus broken ribs, torn bicep, crushed vertebra)
Rode a 52 mile race and was losing ground and thought it was the altitude. Had my shoulder surgery and it got worse. Couldn't walk up the stairs without a chest pain.
Finally couldn't walk 50 feet without pain and dizziness.
Went to the Cardiologist, had D-dimer scores over 5000 and was in hospital the next few days. It was considered I was lucky.
Spent 15 months on Xarelto and am clear now. Hopefully
He should be fine eventually. He is a young man and they caught it.
Pharmaceuticals are amazing today. As are fancy shoes.