Hi Breezy, and welcome to the forum.

It's a few weeks now since your post so I hope things may have gotten better.
If not and your mood is still off I'd get back to your doctor and tell them how you're feeling.
As you made two changes at once the only way to figure out which is the cause is to reverse one or the other in turn, or drop both together and see if it helps.

The same treatments can have very different affects with different individuals.
If something's not working out, and it started happening with a new medication or treatment, then going "back to the beginning" is usually a good plan. Doctors are well used to this. They will often go through a range of similar medications until they find one that resonates with the client.

Which eating plan did you go with. South Beach or Paleo?
Either way hope things work out and let us know how things work out.