Welcome to the Migraine and Headaches Forum! This forum is for questions and support regarding migraine and headache issues such as: abdominal
migraines, headaches caused by allergies, cluster headaches,
headaches, headaches in children, migraine headaches, sinus headaches, tension headaches, visual disturbances.
Since you have a positive history of sinusitis the first possibility that comes to mind is chronic sinusitis. It has been 2 years since you last had a CT scan done so there is a chance that the sinusitis has worsened since then.
There can be other causes of one sided eye pain which also need to be looked into like Migraine, glaucoma, wrong eyeglass prescription, trigeminal neuralgia, infections and inflammatory conditions of eye.
This warrants a clinical evaluation by your GP.
Regards