Hah, hah, a sign of the times. That's the last thing I'd want to injest when in the throws of a deep, harrowing LSD trip, yuck.
Really the only thing that "helps", I find, is a watch (if you're able to read the watch that is). Time can help ground you in the sense that you know roughly when the peak will occur, so if you're already overwhelmed 2 hours in, that means "only" 2-4 hours before you're over the hump ;-)
Taking LSD is very much continually answering the question, "here, ultimate (un)reality, isn't that what you asked for?", with "Yes". Easier said than done when you're in the thick of it...