I'm so sorry your sight is diminishing. Mine too, and it's a challenge to always adapt to a new low in vision.
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First, you need some wrap around sunglasses that don't let much light in. That will help you, I hope. :-)
Here's the link to the US Amazon for some sunglasses that might help and cost only $30. I'm hoping it transfers to your UK version:
Rapid Eyewear Nimbus DARK CATEGORY 4 SUNGLASSES for Extreme Sun Conditions and Sensitive Eyes (Photophobia). Glasses for Men and Women
$1​
Second, try looking for a counselor/therapist who specializes in adjusting to vision loss.
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Here's someone in my area, and I hope you can find someone like this in yours.
$1​
For example, here's someone on your side of the pond:
$1​
Here's what I entered into Google: Uk vision rehabilitation therapist
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No quotes just the words above.
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Wishing you well!