<s>[INST] I'm a 72 year old active healthy woman. In the past 3/4 weeks I've experienced the following symptoms:1. Unusual Tiredness 2. Heightened Anxiety3. Low physical energy4. Unstableness when walking and walking slower than usual5. Occasional Twitch sensation in legs6. An episode of Blurred Vision    7. Momentary Brain Fog8. A sudden, unexpected fall, a short visual blackout and then an upset stomach Any idea as to what all this could mean?Much appreciated, thanks. [/INST] Hi,Thank you for posting your query.I have gone through the list of symptoms that you provided. There are too many of them, and you require a detailed and careful examination to come to a conclusion. A few diagnostic possibilities I would consider are:1. Vitamin B12 or D deficiency,2. Hypothyroidism,3. Low blood sugar or sodium4. Less blood flow to the brain, etc.I hope it helps.Please get back if you require any additional information.Best wishes,Dr Sudhir Kumar MD (Internal Medicine), DM (Neurology)Senior Consultant NeurologistApollo Hospitals, Hyderabad,My personal URL on this website:   My blog: </s>