What could cause foreign body sensation in the eye?

Hi doctor,

I am a 43 year old male. I did not have any eye problem until I went to the eye doctor to get a regular eye checkup. I am always on the computer and watching television. Also, I work as a clerk and receiving goods in the computer. I have been doing this for the past 15 years with no eye problem. When I visited the eye doctor, she gave eye drops in my eyes. Then, after some time, she dilated my eyes and looked inside. She said that my vision is perfect and nothing was found. After my eyes started to wear off from the eye drops only my left eye clear up and the right eye was still blurry and one to two days later that right eye started paining like pressure. Then, I started to feel like something in my eyes. I had a feeling of a foreign body sensation or object. I went back to the eye doctor. She took a look inside both eyes and also checked the pressures on both eyes. She said everything looks fine. I went to a medical doctor and had a scan of the eyes and no problem found. My eyes feel so dry even in the mornings. My right eye is twitching and that feel worst like it is sticking to my eye when it twitches while blinking as if it is so dry. I am using Systane eye drops, but I do not think it is working for me. Please help.

Thank you doctor,

What about the twitching in my eye? What do I do about that? Also, please explain the lid massage.