Suggest Treatment For Extreme Fatigue And Joints Pain
A neurologist might be more appropriate.
Detailed Answer:
I read your question carefully and I understand your concern.
The answer to your question is not that straight forward due to the multitude of conditions you have, several of which could be related to your symptoms, memory issues included. Each of those condition might be responsible alone or contribute with the other issues to cause the memory issues and fatigue you describe.
If the memory issue is the primary concern you want to address my choice would be a neurologist. I believe a neurologist would be the specialist of choice in assessing the severe fatigue you describe as well. If anything he could exclude and avoid taking unnecessary medication for Alzheimer's and Parkinson's.
I remain at your disposal for other questions.