Lion's Mane in my opinion synergizes best with magic mushrooms or other mushrooms (Reishi, Amanitas, etc).
Lion's Mane certainly couldn't hurt your trip--it could only make it better.
Although I have never in my ~10 years of taking Lion's Mane on and off experienced a direct decrease in anxiety, it may have indirectly resolved some anxiety by enhancing my cognitive abilities and thus improving my performance.
Lion's Mane makes me smarter. And it improves my long term and short term memory. I am able to multitask better on it.
It won't improve nausea. If anything, it's a bit of a stinky herb.
From the unspoken
Grows the once broken