So, this is what really set me off on my latest anxiety kick.
In April I woke up with "visual snow" - seeing flickering TV snow/static in my vision 24/7. It is more noticeable against the sky or large blank surfaces like walls. It's very noticeable in low light and has made me practically blind in the dark because the dots are in the way.
Shortly after, I started seeing this black spot/shape/blob in the centre of my vision whenever I blink in a low light setting. It's the same in both eyes, I've tried blinking them individually. It only lasts a split second but it's almost like a delay in my central vision. If I open my eyes, blink or even turn my head to look at another part of the room, I see the shape appear against the wall for a split second.
I then noticed I get a bright white flash in the same place whenever I blink against a bright sky, or when I first wake up and look out of the window. It's like a small white flashbulb - again, present in both eyes. It seems to have something to do with going quickly from dark to light.
I got quite loud tinnitus at the same time as visual snow too, a high-pitched frequency noise searing through my head.
I've been to see an Ophthalmologist now, and had my eyes thoroughly tested and they are ok. However, they want to do an MRI. So, of course I'm now going out of my mind with worry that this is a brain tumour. The doctor didn't seem to think this was likely (of course she couldn't say for definite which is understandable) as I don't have any other symptoms like headaches, nausea etc; these aren't classic visual symptoms of a tumour (I passed the visual fields test for example); and I wasn't put on the urgent waiting list which they would have done if they suspected a tumour. However, I'm still going mad with worry and convinced the end is near.
I know the likelihood is this is all linked to visual snow as it appeared around about the same time, and with visual snow you see lots of other visual weirdness. Being an overly anxious and hyper-aware person I've probably been concentrating on my vision too much lately, therefore more likely to notice things. Yet I can't shake my worries. I know seeing this spot in both eyes means it's a neurological thing.
The crazy thing in all this is I found out my mother sees the same things I do. She has the visual snow and the shape in the centre of her vision (I asked her to test if she sees something in her vision when she blinks or opens her eyes in low lighting and she described the shape and movement of the spot thing I see without me telling her, and described it so well that I'm convinced it's the same thing I see). You'd think this would reassure me but I can't shake the nagging doubt that I've got something really serious wrong with my brain.