Under my left eye has been twitching for a week. Now I feel pressure below my eye like it's sinuses and my left eye feels like a lot of pressure behind it. I was diagnosed with Pseudo tumor cerebri however it's not the same feeling as I had before and I take Diomax everyday. I know when the weather changes is usually when I can feel pressure and headaches. No headache though this time, just twitching and pressure and it is only affecting my left eye. No where else.