Can you go back to the podiatrist? Let them know that what was recommended didn't work. (and did they truly not work, or are you simply trusting the PT without trying them?). Ask for some other recommendations. Try going to a chiropractor, some times they see things the others don't.

The problem I found with foot issues is that every discipline has a different way to treat it: PT, ortho, podiatrist, and chiro. Plus many of them seem territorial and quick to put the others down.

Also, it might be worth trying the "concrete feeling" inserts. I have a pair of custom made orthotics that are hard plastic. At first it felt weird to walk on them, but as they corrected the problem I was having, I grew to love them! I run and bike with them. It did take about a week to get used to them.

Good luck.