
About 3 Days Ago I Started Feeling Very Weak And

Probably anemia or vitamin b12 deficiency, more details are needed.
Detailed Answer:
Hello dear and welcome to ‘Ask A Doctor’ service. I have reviewed your query and here is my advice.
There are many medical conditions that can cause your symptoms.
Other information is needed to help me through the diagnosis.
Do you have other symptoms like pale skin?
It can be anemia. A complete blood count would confirm or exclude this diagnosis.
Do you have anxiety related to fainting episode?
It can be anxiety.
Do you eat a healthy diet?
It can also be vitamin b12 deficiency.
As I see through your medical history you had vitamin b12 deficiency years ago.
Awaiting for your response to be able to help you better.
Hope I have answered your query. Let me know if I can assist you further

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