I had a dehydrator and found it invaluable for making changa.
I'd let it go until it was dry... and then leave it in for probably an extra day beyond that to satisfy my paranoia.
Do you know anything about how much and what was used for a MAOI? Do you have any other symptoms besides headache and fever? Are you certain everything is as it should be with the MAOI? Were any other herbs or extracts that could cause a bad reaction mixed in?
Some things will come easy, some will be a test