My right side of the body is weak and less developing

[FHSUser]

I am a 34 year old male. I am having an illness that no one seems to understand and therefore still not diagnosed. It started 10-12 years back when I felt a slight unbalance in standing while I was waiting for a bus. Initially I ignored it but since then it increased manifold and turns out to be affecting the whole right side of my body starting from the neck to foot. The right side of my body is weaker as compared to left side and appears to be not developing as it should be. Due to this I feel pain in my right leg when put body weight on it similarly the right hand also pains when I push something hard or press something hard from it. My back also pains while sitting, driving or just standing. Because of this illness and pain I am having difficulties in standing, walking, sitting and lying. Often I feel numbness in right leg and arm specially after getting up from bed. Occasionally I feel headaches and sometimes when I bend down on knees it feels that all the matter in head has flown towards fore head making the head heavy. My life is getting worse due to this illness and I cannot live a normal life. I have consulted many doctors but to no avail. Most of them are unable to understand my condition and said that I am normal and perfectly alright. I am an IT professional and my job is to develop software therefore I have to sit in my office for 8-10 hours for 5 days, however, I take short breaks after every hour or two. Kindly help me identify and cure this disease.

Regards