Oooh, that makes it hard alright.
Though I did see a spell on the Pathfinder SRD that could be of use here.

"Accept Affliction"
Its a single target spell that lets you transfer a variety of afflictions, including diseases to yourself. Its a 3rd level spell that druids, clerics, paladins, bards, and witches get access to.
The sourcebook is Champions of Purity

Could be some potential to lower the need for removing disease if your DM allows you to absorb the same disease twice through a use-activated wondrous item of that.

On the high end of things, Mass Heal cures Disease, so scrolls of that could help. As does Heroes Feast. But you likely would have difficulty casting those even from scrolls as it stands.

I'd say at level 6 though your best bet is first identifying the disease and how it spreads. Isolate the afflicted (or the healthy, whichever is easier) and begin systematically purging the disease through use of mundane and magical methods from all affected areas.