Experiences - Bad Trip on Mushrooms - How to Avoid Having Another?

[actarus]

Swim has done shrooms about 10 years back.
Dried Mexican psilocybin shrooms bought in a smartshop in amsterdam, so he guesses quality was good.
He did em at his house with 2 close friends, the setting was fine, home alone (parents were away for long, close friends...)...well... it was the most fuckin terrible experience of his life.
His mind was running so fast, like 1000 thoughts per second, that he thought it was gonna burn off. He was trippin the fuck out so strong that he couldnt even think in his mind the logical-basic sentence: "I-am-in-this-state-because-I-ate-mushrooms". He realizes he shouldnt be tryin to fight back the effects, that just would make things worse, but he was so hammered he couldnt control his mind: the shrooms have taken over.
Then after a few endless hours (when the sun rose...) of pure pain the effects started to wear off a little bit and suddently, really all of a sudden, his horror-pain trip turned into a good one.
The peak was past gone, effects were lighter and swim just felt weird but good, laughin, totally altered sense of touch, etc.
Since then, however, swim has never touched any hallucinogen anymore. He's scared to death.
He's afraid the even if he'll be in the rightest setting, in the rightest conditions, in the best state of mind, his trip will turn bad because of the memory of that night, the deep scare that produced in swim's subconscious will eventually come up.
Do swiy think swim will never be able to experience a real good trip?
Swim did X and mandy several times and just fuckin love it.
Swim read about the candy-flipping (or flower-flipping, hippie-flipping..whatever..):
do swiy think if swim would mix shrooms with mandy, the mdma's positive effects will chase away the chances of havin another bad experience/trip?