Thank you, everyone, for your suggestions, support and concern.
He got home from attending the funeral and I met him at the door and asked him how he was feeling. His back still hurt, but he just feels he twisted it wrong or pulled a muscle. He has had back issues before. It just worried me when he said his stomach hurt too. He wasn't sweaty or clammy. I told him I thought he should go to Urgent Care, but he pooh-poohed the idea, even after I told him some of you thought he should seek medical attention. But, since he wasn't feeling worse, I didn't insist. He has spent the afternoon resting, with the heating pad on his back. I made soup for him, and have been watching him. He's been napping a little, so I think if he was in really severe pain I don't think he would be able to do that. He plans to rest tomorrow too.
He's the type of guy who won't slow down when he has back issues, so it takes longer for his back to heal. But with a couple days of rest, hopefully he will be feeling better by Monday as I doubt he will take a day off work.
Thanks again, everyone. Sorry I didn't get back here sooner to update. I probably shouldn't have even started the thread, but when he felt so bad before he left to go to the funeral, then I was home by myself wondering how he was doing, etc. and did some research on the internet (that's not always a good thing

) I got even more worried. I should have just waited to see how he felt when he got home. And, he went to the funeral with his two sisters and brother-in-law, so he wasn't alone.