Brief Answer:
Diff Diag : 1. Anemia 2. Rheumatoid Arthritis 3. Cardiac Problems

Detailed Answer:
Hi,

Welcome to HealthCareMagic.com I am Dr.J XXXXXXX Anto Bruno Mascarenhas, and I am here to help you. I have read your question with care and understand that you have the following problems

1. You are always exhausted after walking very short distance
2. Have a extremely tense back and neck muscles
3. Brain Fog and Very Bad Memory
4. Stiff and sore knees and Ankles

The Common Causes for these symptoms may be
1. Anemia
2. Rheumatoid Arthritis
3. Cardiac Problems

You need
1. Clinical Examination
2. Blood Investigations
3. ECG
4. Chest X Ray, X Ray Neck, X Ray Knee and Ankle

I would request you to consult your Family Physician for a Complete Evaluation

Hope you found the answer helpful.

If you need any clarification / have doubts / have additional questions / have follow up questions, then please do not hesitate in asking again. I will be happy to answer your questions.

Best Wishes for Speedy Recovery
Let me know if I can assist you further.
Take care.

-oOo-

PS 1 : After all your doubts have been cleared, kindly (a) Close this Question (b) Rate my Replies and (c) Give your vauable Feedback.

PS 2 : In the future, for continuity of care, I encourage you to contact me directly in HealthCareMagic at http://bit.ly/askdrbruno

---