Sick Plant
 

I have an orchid, I believe it is a Miltonia Confusa and it appears to be
sick. I recently repotted it and then its leaves started to turn yellow. The
leafs also have dark spots, I don't know if the spots are a sign of the
problem since they mostly appeared after the leafs started to turn yellow.
It this a normal process for miltonia's or is my orchid sick. What do I do?
What could it be?

RM