I feel your pain!!! Dr. Scholl's are way too light for support, I bought insoles on TW, orange. Thorlo socks may help, too.
I found that Babolat shoes offer the best support, but I am a female player.
Mikeler gave you a great idea about that device, I ignored you could buy it (I had few sessions at the doc's and they do work). Also, find a good anti-inflammatory gel (you might need prescription)....all the best!