Soo this is the second time in a couple of days where my vision has gone funny.
The first time was when I was going to sleep a couple of nights ago and I suddenly got a pounding headache on the right side of my head, I was on my phone at the time and my eyesight started playing up. It felt like when you have a bright light in your eyes and that's all you can see when you blink afterwards. This lasted until I fell asleep and it seemed to have gone by the time I woke up. Sorry if that's not explained too well, it's quite hard to describe it 
So, it has now just happened again, and the only way I can describe it is as if there is a kaleidoscope, it's not my whole eye sight-only the peripheral vision, but it was in both of my eyes. I could barely see at all and it was actually kinda scary.. I once again had the pounding headache on the right side of my head which came out of no where. My vision is practically normal again now, the "kaledoscope vision" lasted about 5 minutes, but the headache is still here.
A little background which may or may not be not be relevant:
The first time it happened I had the reflection of the light bouncing off the mirror, into my eyes. The second time the sun was really bright through the windows. I am currently sat with sunglasses on in the house with all of the curtains closed 
There is potential I have Graves' disease/hyperthyroidism- I can give more details if needed
Have been using dry eye drops
Thanks in advance! Appreciate any help 