why waste gold at a temple ???? it's 800 per person; not inexpensive early in the game
option A) have a cleric cast restoration
option B) equip a scroll of restoration in the quickslot and have a mage cast
similarcum or project image. casting the restoration is now free
Option C) Vhalors helm found in adventurer's mart can be used to implement option B

expensive but your going to get that item anyway
Windspear hills can be done straight out of Chateau Irenicus I would certanly reccomend doing it asap if you have a Paladin onboard if not take your time Firkraag is hard at level 8-9 and unless you need Carsomyr he can wait
to avoid this in the future send an enraged char to deal with vamps, and fight them from a doorway so as not to get surrounded. The rest of your team fires arrows from behind the blocked door. negative plane protection can help but it only lasts 30 seconds.