Irlen Syndrome/light sensitivity glasses. Can anyone help?

Recently I've been experimenting with dark welding sunglasses to stop my brain "falling apart" in artificial light and the results have been outstanding. In fact, if I wear them while sitting down in the pub, I'm able to keep clarity of thought even while drunk. (this is very very strange for me, but also wonderful)

As a result, I'm pretty sure I have a bad case of Irlen Syndrome. My brain is constantly fighting light and it really impeads my life.

The problem is, I don't see any route to getting some Irlen glasses/sunglasses that's not going to end up costing a huge amount of money.

Can anyone point me in the right direction? (if there is one). Has anyone gone down the private route, how much did it cost?

Thankyou.