Hi Jayne, according to an article at the AoS website you can make your own repellant for this type of crawlies. Water and some sort of herbs. Like onion, or garlic or jalapeno peppers then spray. I will pm you the link to the article since I do not know if I can link here.
Thanks for the link. I may try something with garlic. Yummy....
I got home late from work today and didn't get a chance to repot the orchid. If anyone is curious, I did catch three little worms that are 3-5 mm long, light amber (almost transparent) body with black head. I guess they could be anything.