What to do about my instep if i'm pregnant?

I STAND ON MY FEET ABOUT 7 TO 8 HOURS A DAY WITHOUT A BREAK AND I'M EXPECTING AND WHEN I TURNED 3 MONTHS I STARTED HAVING TROUBLE WITH MY INSTEP MY DOCTOR SAYS THERE'S NOTHING HE CAN DO BECAUSE I'M PREGNANT. I CHANGED SHOES GOT ARCH PADS AND ELEVATE MY FEET WHAT ELSE TO DO??