Replying to Strange pain (lateral arch)

Okay now this is pretty peculiar pain in my foot. I got new boots this season and went up to killington a weekend ago. When I was up there the first day I skied and had some pretty bad pain in my feet in the areas of both feet right opposite from the arches in my foot (lateral arch I believe) the pain is strange due to the fact that when I'm constantly skiing on the hill, the pain is much less but whenever I'm standing for a long time or sitting on the chairlifts , the pain comes back. I have gotten full custom foot beds, which I figured would have solved the pain, and the podiatrist who made my foot beds, also thought this was the case. But alas the last 2 days the pain has still been there. Now is this just my feet getting used to the boots again? Because I had figured by the 4th day of the season that this pain would be gone. If it isint, does anyone have any other recommendations for me? Thanks again