I recently purchased my plant. I repotted it in a pot that drains. It has started to appear to be wilting, with no color change. It hangs by an east window and doesn't really get direct sunlight. There is a register 4 feet to the north of it and a fireplace that is used occassionaly 5 feet to the south of it. Is the wilting just the shock of being repotted and moved or is it being exposed to too much warm air? It had flowers on it but they all wilted away within a few days. What should I do if anything?

Re-potting is probably the culprit, as well as the warm/dry air from the fireplace and heating vent. Newly purchased plant shouldn't be re-potted, they really should have an adjustment period to get used to the lower light change and humidity change for a while, that can be stress enough.
Re-potting should only be done when absolutely necessary. If the plant was flowering, that's another reason never to re-pot because you will most likely lose all flowers, whatever plant it is.
If possible, I would suggest removing all the extra soil if you went to a bigger size pot (most plants like to be on the root-bound side) and putting it back into the original pot or one the same size.
When you do come to the point where you HAVE to re-pot, only go up one size or an inch bigger around than the root-ball, anything much bigger could result in rotted roots because the soil stays wetter longer and can deprive the roots of oxygen
Maybe moving it further away from the fireplace or any other heat sources close by wouldn't hurt. Put it where it gets indirect bright light, a little sun is ok and let the soil dry between waterings.
No feedings for an ailing plant and none in winter.