Okay guys about two weeks ago I went low-wheat (not no-wheat entirely, just low) and high protein (mostly lean meats), nuts, and fruits and veggies. It went pretty well at first but now I'm feeling weak as a leaf. I was at work thinking I'd just fall over any minute and lifting anything took a ton of energy.

Am I doing something wrong or is this just a fluke?

P.S. I take a multivitamin and drink of a ton of water.