http://www.comics.org/ has hundreds of thousands of comics you can search though, but you will need to know the title you want to search for first.
I'm not familiar with the story you're looking for, but it sounds like the kind of stuff DC was doing from the late 60's through the early 80's. It could be indie as you suggest, but most indie stuff from the 80's was black and white and there wasn't a lot of horror. If it's not DC it could possibly be Charlton or something. The plot feels like a DC anthology story to me, though, which would mean Unexpected, House of Mystery, House of Secrets, The Witching Hour or something like that.
Bookmarks