Thanks to all that replied.

I was doing so well and had returned to work on reduced hours that I felt it all crashing when the symptoms came back and was put off again. I still have no idea what the trigger was, perhaps I was not careful enough and got carried away that I was feeling pretty well.

It started getting better around the 8 day mark and significant improvement by the 13th day. I still have a few symptoms lingering around at different severity levels.

Going to visit my GP and behavioral optometrist tomorrow for a re-assessment.

So back to the drawing board I guess, wait for a bit and try again.