My friend, i have a similar problem with my right eye because of dirty weed. It started slowly and progressed over a year. Now it's been 2 years and it's a bit better, but i have chronic issues with my eye.
It started with my eyelid flickering and being droopy, then i felt pressure behind the eye and temple. Then i started having extreme pain in the eye and the right side of my head. It hurt so much that i woke up in the middle of the night and i cried in agony, i had an urge to hit my head on the wall. I thought my head and eye were going to explode, and i was afraid of going blind. Over time the pain reduced, but i had all kinds of different problems. Blurred vision, couldn't move my eye properly, the blood veins in my eye would get red and inflamed and it felt like having needles or sand in the eye. It's still sensitive to this day.
This only happened from smoking a certain kind of weed, which i believe it was dirty with pesticides, fungicides or something else, maybe laced with synthetic THC or something.. Usually this weed had a very strong smell that makes you dizzy, not very pleasant, very heavy smell. And while grinding it, it was leaving a wet white residue on my tray. The ashes burned black like charcoal and the joint crackled. The taste was a lot like chemicals. The weed looked perfect, like something out of a 420 magazine. It was perfectly dried and everything. Actually it looked like PGR weed when you Google it, it looked almost too perfect.
I was changing all kinds of different weeds over the past 2 years, and good weed doesn't cause me any problems, so i am 100% sure i only had problems with specific weeds. Good weed helps my eye pain.
I went to the doctor, they couldn't find any problems (although i never visited a doctor while high on dirty weed, so the inflammation was never as intense as while smoking it)
However, they saw that my sinuses were a bit inflamed, and sinus inflammation around the eye can cause a lot of pain. It can also come from teeth. How are your teeth? Do you have any problems with gums or bones? Do you have a root that needs to be removed? Root infection can spread from tooth to the bone, and from the bone to the sinus, and from the sinus to the eye, ear, throat..
Either that or it's just really bad weed that you're smoking and i suggest grow your own or find other dealers. Matter of fact, i am 99% sure the weed you smoke is dirty because i heard a lot of stories about UK weed. Just trust your nose! And please don't smoke that shit anymore, the more your eye gets inflamed the more permanent damage it can cause.
And i bet this weed you smoke doesn't even make you feel good. For me, it felt like i took 20 sleeping pills and drank alcohol, my mind would go completely numb and i felt like a zombie. For example i would listen to music, the whole song would pass and i couldn't remember listening to it. I couldn't think straight, and it felt like my brain was malfunctioning. And this was before eye pain started. So you can imagine it got even worse after the eye pain started, i would be a zombie but in lots of pain and paranoia because of the eye.
Do you have similar effects? Does it make you feel like a zombie too? Do you just doze off staring at a fucking dot on the wall for 30 minutes without even being aware of your thoughts? That's how this weed felt to me.