Fight through it.....Once you are on the other side, your energy levels will be off the charts, I promise you. It should only last a few days, but you can supplement with something like Maca root powder to help you get through. I like the gelatinized stuff by "Terrasoul". It will help keep your energy levels up. Also I found vitamin D supplements helped me get thorough that initial exhaustion.

Keep up the fight, it's worth it in the long run.