Wow, I think I'd have reacted the same way, Sandpony!
However, I don't think you did any major damage to your Orchid with just one spray. I'm sure that you must have flushed the planting medium right away, after you realized what you'd done... or maybe replaced it with new. Not having ever been faced with this situation (or having heard about someone else doing it), I must admit that I'm only guessing, but we can always hope that your purple phalaenopsis will be OK!
Be sure to come back & let us know.
By the way, welcome to the forum!
You'll find that we're a bunch of friendly people here, all willing to help each other as we share our gardening experiences (as well as our hobbies, pets, kids, recipies... the list goes on, as you may have noticed). I'm looking forward to getting to know you & hearing more about your Orchids.... & your other hobbies, pets, kids, recipies, etc. (Oh, and we LOVE pictures here! Would love to see what you've got blooming!) Please stop in at the New Member forum & introduce yourself if you'd like to... or, just jump in on a topic & join our forum family!