I'm so glad he's fine!
I know what it's like to worry about them. I will never have kids due to some health problems, so my horses ARE my kids. I worry about every little thing! Not that it's good to worry, because it's not. I'm just saying I can completely relate!
I remember freaking out last year about a red spot in John's eye (my mustang) and got the vet out and everything only to find out it's due to the shape of his lens or something, and that it is totally normal for him, even though it looks odd. And sure enough, it's been there ever since and has never given him a lick of trouble. I am just wondering why I never noticed it before, because when I freaked out I thought it was something new. So anyway, I'm glad he's well! Welcome to horse worriers annonamous, lol!