My blood pressure is 111/56 and pulse 86 i feel alot of fatigue energyless pain in body even cant concentrate im just 21 years old height 5.1 and weight 48 kg kindly tell what should i do ?

Basics: You perform at your best when you get adequate restorative sleep, good nutrition, are healthy & work in a stress free environment. If you haven't done so I would see your doc for a good checkup including some basic tests for anemia. After that, I would look to the other parameters of nutrition & sleep to see if changes are needed. You may need help to deal with stress issues if present.