My Iguana is trembling and I'm at a loss?

I have a 4 foot Iguana and I have been giving her 3 drops of calcium orally as direct by the bottle for the beginning of MBD. I keep her in under the UVB and a heating lamp as well as a pad during the day. At night she sleeps in my bed on her own pillow. I don't know what to do. this morning I woke up and her left leg was trembling and her tail was swooshing side to side. please help.