Hi lync,
I only know about Allodynia because it is a potential side-effect of a medication that I have to take every 3 weeks by infusion so prior to each infusion I am asked a long series of question pertaining to side-effects.

Basically, I would try a process of elimination. Try a soap that is unscented and doesn't contain sodium lauryl sulfate. That's the chemical in most soaps that makes it lather.

Nearly all my adult life I've used Dr Bronner's castille liquid soap. It's made from vegetable oils and doesn't contain the sodium lauryl sulfate. It comes scented and unscented.

The problem with the gas/petrol is concerning. Is there someone who can fill up your car for you?

I'm sorry that you're dealing with this so badly. Maybe it's time to get another Doctor's opinion if that's possible.

You posted just fine, by the way.

There is also a forum for allergies and multiple chemical sensitivities.
Allergies & Multiple Chemical Sensitivity Forum

You could also try the Advanced Forum Search Feature by typing in the keyword "Allodynia".