Morning all, 

Over the past couple of weeks my pupils have suddenly become different sizes, in the dark they are pretty much the same size but when the light is on my right is larger than my left. Both pupils contract to the light but then the right one goes slightly bigger again and it's clearly visible they are different sizes.

I've had tension headaches for a few weeks and every now and again have a sharp pain in my head, i did a few weeks back have pain in my neck but that has now gone.

My vision can be a bit blurred at times if I'm in front of the screen too long, I've seen an eye specialist and also been to the opticians and both have said my eye health is fine.

GP is referring me for an MRI of the brain and I'm so scared of what this is going to return, has anyone else had this before and it turned out to be nothing? I know I shouldn't google but everything for my symptoms refers back to brain tumours or aneurysm. I've had drops and the pupil responds to drops so it's not Adies Syndrome. Although my sight test was fine, I had to do the visual field test a few times as I struggled with this, the left eye kept going black but optician didn't seem overly concerned? 

Any help or previous expereince would be appreciated, I'm a huge worrier and just want to know what's going on. GP said he'd refer for an urgent MRI but I haven't heard anything yet and that was a week ago.