Hey again kenlee, good to see you back.
When you say "a while after", do you mean just a long time during the trip, or do these feelings persist after the trip fades?
The former is quite normal, I think, but the latter maybe less so. Are you able to eat non-psychedelic mushrooms without issue? Just trying to understand the likely source of the nausea, if you get it from other mushrooms then obviously it's more likely a
mushroom issue rather than a
drug issue, and the latter is very common due largely to the large volume of serotonin receptors in your gut.
In either case, though, there are a few things you could try. The simplest would be to consume them with an empty stomach and see if that makes a difference. Failing that, maybe try preparing your truffles in a different way, blend them up and mix them into a milkshake for example to see if that makes a difference. You could also try some natural anti-nausea options, ie, ginger, mint tea, probably there are some others. Or if you're OK taking a stronger approach, OTC motion sickness pills are reported to help combating the nausea on a lot of psychedelics, ie, dramamine, diphenhydramine...
I don't actually have experience doing this myself as I'm lucky enough that very little makes me throw up - although psychedelics obviously do for many people - I had a mate a while back basically projectile vomit on a fairly low dose of metocin... twice actually. But I would expect any one of these options to help, definitely the medicine, if all else fails, although you should as a general rule try the more gentle approaches before adding in more drugs, even such benign and mostly CNS-irrelevant ones such as dramamine.
Not really familiar with how a food dehydrator works, to be honest but if it does it gently I would think it would be OK... ie, not too hot, not too much agitation... again though not 100% sure about this, I would think any potency degradation would be very minimal but hopefully someone else can chime in.
EDIT: One more thing as I just noticed you were talking about microdosing - if you are microdosing properly, ie, dose almost to entirely impercceptible, do you think the nausea would still be an issue? Because I would think it would likely also be negligible to nonexistent.
