Six more miles until Hiker Town Hostel. Through friends of friends we have obtained Flagyl. It should be at the hostel tomorrow morning. (friend of friend, we have a giant debt of gratitude to pay to you. Name your price (or poison) and it is yours.)
 
Past PCT through hikers have given me some very good advice. If you want to quit. wait until tomorrow and make your decision then. It's reassuring that other people have sucky days (weeks) and come through just fine.