It makes no difference whether they are dry or wet; wet shrooms and dry shrooms are both shrooms. Based on the strain, moist ones can be more strong, while dry ones can be more potent. But a regulated dosage would be 3.5 grams, or an eighth to trip, but if you’re a newbie, start with 2.5 or 3 grams to get a feel for what tripping is like.
Presently, researchers in the United States and the United Kingdom are investigating it, and it appears that it DOES lessen symptoms. (The response is significantly stronger in the case of BPD, but that is a different topic.) Those who previously used narcotics should understand that you were taking raw mushrooms rather than a consistent medical dose: that rarely happens in nature, let alone on the black market. The majority of these doses are very small and are intended for therapeutic purposes.