In answer to the OP - no, I do not think witchcraft exists. I think what you are experiencing is down to suggestion and your own subconscious and your own beliefs.
Nor do I believe in "magic". And if those who do wish to make use of terms like energy, which has a well established meaning, then they will need to defend their own interpretation of the word. Energy, like Quantum, are terms often co-opted by various alternative practitioners, but can offer little observable evidence of energy manipulation or quantum effects when tested.
"Energy" is measurable. Quantum and its effects are understood, if imperfectly.
So if I am being honest - I find the cavalier use of the terms more than a little irritating.
And one further side issue, since it has been raised in the conversation. Can someone explain to me why exactly beliefs and faiths are worthy of automatic respect? Some beliefs, some faiths are worthy only of derision and scorn, in my opinion, and just speaking empirically, all beliefs are most certainly not equal, nor should they be.....