Hi Kim,
I dont know area but there will no doubt be a pharmacy somewhere nearby they are everywhere.
I can give you a little advice on how to treat the blisters if that'd help?
If you can't walk there, maybe ask someone to go for you.
If they can find a small 10ml syringe you can use that to drain the blisters.
Failing that, a small sewing needle, sterilised with a flame will work.
Inserts the syringe/needle to the side and at the base of the blister (nearer your foot) and allow to drain.
Do not take the skin off the blisters as this can lead to infection.
Dry the blister in open air then you must cover the blister but try avoiding using anything sticky on the blister skin itself because when you come to pull the dressing off, it could pull the skin.
Another tip is when the blister is drained, use a sterilised thread through both ends of the blister to allow an opening for additional fluid to drain out overnight. VERY USEFUL.
If your blister smells, or goes excesively red it could already be infected, and you need to see a doctor.
when your good to walk again, heres a few tips.
Buy womens sanitary towels!
You can place them on top of your inner soles, fold the 'wings' and stick them to the underside.
They absorb a load of moisture that causes blisters and gives extra padding for the soreness.
When walking, stop as often as you need and do the 'blister drain' process thoroughly. Your feet need to be your main priority!
At every stream, stop bathe the feet, take down the swelling, dry thoroughly, drain, dry, re-dress.
You may also want to try wearing a second pair of thinner socks.
This allows the 2 pairs of socks to rub together and not on your foot.
Most importantly, stay positive. This is just your body's way of saying STOP, you need to pay me some attention. Time and care now could make the difference.
Good luck kim and Buen Camino!
Greg