Im on immunosupresents for Crohns and with 2 kids at school bringing home all sorts from Oct - April last year I was on antibiotics 3 times and I dont take them lightly, I just cant beat everything on my own with these tablets and 4 colds.
Drives me nuts as I struggle to get any consistency in the winter with base miles etc and as a result enter the spring not as prepared as a I should.
I suffered on and off with the same thing in a pair of neutral shoes being the Asic gel Nimbus range, I didnt like the 14's so switched to Brooks Ghost and so far im really pleased.
I dont have low arches and my gait is slightly off on one side in that I over pronate.
Ive read conflicting statements on arch blisters I think the key is that you need to understand why you are getting the arch blisters. Sorry if that sounds stupid but by that I mean is it your gait or the shoes/innersole themselves etc. Once you know then you can make a more informed decision as to the way forward.
If I were you I would be getting a gait analysis done and take it from there. Maybe get a couple done at a few stores and speak to them about your previous shoe choice and arch blisters.
There are also such things as engo patches you can stick inside the shoe itself to ease friction and perhaps twin socks, body glide etc etc.
This is soo true possibly exasperated by the fact most marathon training plans out there that beginners follow dont actually get you up to race distance before the day which sorts of adds to the mystique of the last few miles.