So I finally got to Sturmford and managed to take quite a bit of damage (down to 0 for one character and a little negative for another). Made it back to the inn and paid for a room. Two characters that had sill a little health recovered fine, but the two characters at 0 or below aren't recovering at all. Then I happened to see they were "diseased" but the local shop only had ONE Cure Disease potion. Do these potions get "restocked" or is it totally fixed at some preset limit? How do I get more potions? I'm certainly not adventuring with a diseased character in the party.

Or is this one of those cases where I have to reload a previous save?

There is a temple (church) in southern part of Sturmford (east of the gate). Talk with NPC there to cure disease and other status ailments.

Edit: And yes, merchants restock their wares once in 2 weeks.