welcome to Just Answer. I am a neurospecialist, and will try to help.
Can you tell me more about your daughter's medical problems, especially about the headache and arthiritis of the neck? Also, does she have any other medical problems such as diabetes or blood pressure probblems?
I have moved your question to Q and A for ease of answering, as you are now off line. If you answer my questions above, I will give you my beat answer as soon as I can.
Thank you for your patience.
Your daughters pain can certainly be controlled. You have not told me what medications she is on, but medications strong enough to treat pain can often cause side effects such as tiredness, and the stress of the chronic pain can also contribute.
I am glad to hear she is working with a neurologist , but if the treatment has not brought relief in 6 months, she made need another opinion.
If you tell me about the medications she has already tried, I will try to give you some help in thinking about other treatments she could try.