are you soaking in epsom salt baths?

This would improve circulation and perhaps help. Magnesium is helpful for restoring blood circulation in the periphery.

However phenol is very damaging. There may be permanent damage from it if it burned you so badly.

I had a boulder rock fall on my rt. big toe almost 15 yrs ago.
It broke the toe in two places. To this day I have pain and tingling when I flex my toe. Also just recently the nail fell of again...since the injury. Sometimes injuries from surgery and/or trauma are forever I am afraid to say.