It sounds like you need glasses. After getting some glasses your headaches might stop because your eyes will not have trouble focusing. As for the shaking/shivering, I'm not really sure. I normally feel that way when I am sick and my body is fighting off an infection.
Really??what did that eye doctor say? I have known that there can be blurring but shakey images???guess you need to investigate more as to what is happening. afterall its your eyes man. take care.