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1.The history and present symptoms suggest the possible cause could be blood pathology, low potassium level in the blood causes drastic weakness in the
limbs.
2.And
anemia also will cause the similar findings due to reduced
haemoglobin content. Keeping in mind your history.
3.In this case i would suggest you need to be little strong and have some food which contains more of potassium and vitamin and haemoglobin enriching products.
4.As your mental support is needed for your body to get little strength, or else more deteriorates health.
5.Sugget to get your x-ray chest for a over view of the chest pathologies, and blood picture ASAP, and vitals to be monitored. Good luck.
Hope i have answered your query,
any thing to ask do not hesitate to ask.
http://doctor.healthcaremagic.com/doctors/dr-ganesh/62888