Always take mushrooms on an empty stomach and do not drink Alcohol, Fruit Juices or eat anything. If you do your buzz will be lowered. Weed also works to calm the buzz down (if you've got the right weed
) Most people hate the taste of mushrooms and do feel sick when eating mushrooms, but that does not make you sick just they taste foul.
If you find your buzz is getting too much drink some fruit juice and smoke a nice indica, it will chill you out a little, but be careful, drink too much fruit juice, and you'll not be able to get buzzing again
That's a combination of the advice you would get in a smart shop, and things that I have also noticed. It is not meant to be taken as an absolute fact and description of what will happen.