Anything over 5 grams is considered a "heroic dose" generally. I've done it myself when I was younger a couple times and had a similar experience as you, but then I continued seeking that same experience and after a few more times it ended similarly to OPs story. Now I can't even do mushrooms in my house without intense paranoia.

An analogy Ive found to hold true is, If you think of your mind as a rubber band, you can continue stretching it out as much as you want, but it wont always form back to it's original shape after a while.