Certified GKH Gardening Expert
Have you been fertilizing already? Perhaps a slow release fertilizer? If you lost all that when you repotted, it should be safe to add more slow release fertilizer. If there is question, test the soil first near the roots, then fertilize accordingly.
Hopefully, the plant is just in shock from the transplant and should recover with regular care. Also be sure the pot isn't too large and you are overwatering. The new size should be about 25 percent larger than the original pot.
I've included links to articles that should help pinpoint the cause.