Thanks for the extra information.

I'd start with lukewarm epsom salt soaks to see if your feet respond to that. Don't put too much in the water, as it might sting your toes.

If your pain is confined to only under the toes, I'd try using a good antifungal cream there for 2 weeks. Sometimes fungus can be deeper in the skin and not very visible yet. That is a cardinal sign of athlete's foot. It would be good to get that out of the way as a potential causative agent.

There is also a very cooling product called BioFreeze. I don't know if you have that in Australia...but if you do give it a try.
It is a gel that helps menthol penetrate into the skin and activate cold receptors which then block the feeling of burning. It can last about 6 hrs, but does not heal anything, and when it wears off
the burning returns.

you can look at it here:
http://www.iherb.com/BioFreeze-Cold-...?ic=2&flt=0000

Amazon also has it, but I don't know about Australia. Our Amazon is much less $$ than the iherb link. But iherb does ship to Australia. Here it used to only be available from chiros and
physical therapists-- which is where I got mine originally when I had PT for an injury.

I've used Biofreeze for years for my burning episodes. It is quite nice.

Were you exposed to vaccines, or antibiotics or other drugs?
Do you take a statin for cholesterol? It is helpful to find out what your trigger is, so you can then perhaps use specific supplements to help.