What Causes Weakness In The Left Leg Causing Impaired Body Balance?

Hi, this is Abdul Sami. Im 25 male. I am losing strength of my left leg. Its not anymore able to support my body weight and it has become heavier and it seems that i need to like push it along with me. My body stucture has gone disbalanced because of very less support of left leg and weight points changing towards the other side. I really need you to consider it as this is a problem im going through for 2 years now. I tried consulting doctors but no one came out to the correct results. Some say this is just a muscular pain. But i know what i am going through and the left leg has gone a bit smaller and hanged. The heel of the left leg goes up other than going down. The nerve congestion seems to be coming from the back to the hips and thighs. Would be very thankfull awaiting for an answer.