You've been overworking yourself so much that you knew you should rest but didn't because you have more work to do

Venti his playing his lyre beside you while you worked then you suddenly passed out in his arms

He instantly panicked thinking you died on him "what the.. Hey..!! Hey wake up!!" He panicked

To him the logical thing to do would be to throw you over his shoulder and run to his statue so you can get healed before its too late, he 100% believed you're actually dead