Feeling so weak that you cannot get out of bed is a serious symptom that requires immediate medical evaluation rather than self-medication. Please do not start any new supplements or medicines without a diagnosis, as severe weakness can be a sign of underlying conditions like infections, severe anaemia, dehydration, or heart issues. I strongly advise you to contact a healthcare professional or seek emergency medical care immediately. In the meantime, try to sip water or an oral rehydration solution. Once a doctor identifies the root cause, they will prescribe the exact treatment or targeted supplements (such as Iron, Vitamin B12, or Vitamin D) you need to safely regain your strength.