Kerry.
So glad to hear from you. I have been waiting since your last post to hear the news.  Happy to know all is looking good.
I too was out of energy at 3 months and was concerned that something was wrong. The best I could do was get up take shower. I was in bed most of the time, but would get up and move around and even go out side for a short walk. (VERY SHORT)
I also learned at that time my Thyroid was not working and it added to the problem!  You may want to have that checked out.  I am just now starting to feel human again at 6 mo.
My husband always thought I would be just fine after treatment. (wishful thinking)   He was wrong.  It takes time to heal from all of this.  Even now I have to remind him that I am still healing.  He just wants the OLD ME back.  I am not sure if my old self will ever be back?  We will see!  He would try and push me to do things I could not do.  I would get very upset with him for it. Encourage YES, Push NO.
I too get head aches, more in the sinus area on the left side.  I found if I got up and moved around more it helped.  I would get up and down at least 3 times a day. It would help with the stiffness in the shoulder and neck. I would try and stay out of bed for 2 hrs. at a time. Sometimes it was less.
Also make sure he is not loosing any weight. That too will make him weak. Hang in there, I know it is hard.
Ok, take care
Diane