Feeling absolutely terrible

I had to drive about an hour each way yesterday afternoon with my 4.5 month old. He was not having it. He screamed and screamed and screamed. I stopped several times to try and get him to calm down. As soon as I’d start driving again, he would start streaming.

His voice is hoarse and his cry isn’t even a cry. It almost sounds like a bark. I have this gut wrenching feeling that his vocal cords are seriously damaged. I’m feeling like a piece of shit mom. I’ve only ever let him cry 15 minutes at the most before. Am I being insane or should I take him to be checked out by a Doctor? How long should his voice/cry sound like this? Is there anything I can do to soothe his vocal cords?