I wouldn't worry about it. I had a similar experience, however not with drugs, but during meditation. I got a vision or thought that I would die at age 32. I have a few months til I turn 33 but I'm pretty sure it was all just in my head. Just live your life. We all die eventually. Why fear it? Why worry about it? Personally, I would not put any stock into anything my drug induced, meditating, or dreaming mind came up with. Do you really want to worry about dying every year on Sept 26? Or perhaps its September 2026? You just can't worry about it. It's not worth it. And for what is worth, I don't think you are crazy either. You're going to be fine.