Emre
Welcome to AVMsurvivors!
None of us are doctors but there may be a number of @BrainOccipital members who can relate to your situation. I hope a few may speak up.
I kind of expect your visual difficulties to be related to where your AVM was and any damage that it has done or that the embolisation has done. The most frequent side effect for operating in the occipital lobe seems to be to lose some quadrants of peripheral vision but it will depend on where your AVM is and what parts of your brain it was disrupting.
My AVM was in my right occiput but very much on the surface, so much less likely (I think) to have the sort of effects you’re having but my experience of having the embolisation is that it changes the blood flows in your head immediately, putting high pressure back into the places where you should have high pressure and low pressure back into the places where you should have low pressure and honestly, it feels very strange, very odd. Like you, I still had a decent amount of dizziness and oddness after the op and I worried in the same way as you that that indicated something amiss. I, too, had further scans two check that all is well and again it showed nothing.
My doctor suggested that rerouting the blood flows takes a while to get used to and that, if there was anything not quite right going on, it was far too small to see. And if you can’t see it, you definitely can’t do an operation on it.
So I resolved to accept this possibility and I relaxed and I resumed normal life. You’re a year and a half post op, which is the same point that I was when I resolved to just try to relax and let time get me used to the new normal feelings in my head. I hope you might be able to just relax and get used to the new way your head is. I HOPE that’s all it is. I’m not sure that we should expect glue-filled heads to feel “normal”! 
However, you are definitely not alone.
I hope something here might help.
Richard