Leg pains (nurologic) Wat it could be!

Hi I am having this leg pain when ever I jump a little like from 4 steps or when ever I tap my legs hardly on ground I first noticed it some 4 years back and it is very infrequent comes only when I am stressed out ( I think ) And pain is from my buttock region to till the toe of that leg (feels like centre of sole) dull aching type and I feel like massaging it and when I press my legs it aggravates and it wil be intolerable and decrease during I rest I used to take Acelclofnac tabs (movex) It used To go instantly And when every I try to fold my leg like flexing it I feel like a thread is being pulled In centre of my calf and pain becomes more Please say me wat it is and wat i should do :( I used to go to gym and I used to hav lower back pain and I took an x Ray for it nothing was wrong and I was fine now except for this occasionally When the pain is on both legs I feel like dying really painful Wat it could be