Binocular vision dysfunction. Help me!

I have several symptoms of binocular vision dysfunction and i can feel the small deviation but everyone l visited saying my eyes are normal , even I have visited l v prasad hospital but still there also they are not able to diagnose it . I do pen exercise 2 times a day and warm compress 4 times a day then I feel my symptoms are decreased but I have lot of system work and again when I start doing it again I feel strained and deviation ( only in left eye) . Problem is not getting diagnosed and my work is on system headache is increasing and one of the top hospital couldn't give answer. I don't know what to do and I feel my misalignment in eye could be very small which is very difficult to find and very precise checking it needs but whom should I go when institute like lv Prasad could not do it. And i Don't find any prism glasses out so that I could check wheather how I am feeling. Please help me !