Weakness in body. Guide me in this!

I am having weakness in body especially in legs, it feels light. I gets tired for walking a short distance. No chest pain or breathing problem. In previous month i had undergone ECG and TMT which were normal and the reason for the test is having slight chest pain which is caused due to acidity. I feel my body feels light and i can know the differences when the body was normal few days back and now. Following symptoms. 1. Weakness Feeling. 2. Tired after walking for a short distance 3. Leg discomfortness and weakness 4. General body discomfort. 5. Bowel moment issue, Constipation for 1-2 days. I feel still the bowel is not properly cleaned. Whether the above mentioned details and sypmtoms shows any major issue with the body, or any vitamin/mineral deficency. Please guide me in this regard. Thank You!