Well, then that definately sounds like what you've got. The pain you have right now will go away, it's just like having a pulled ligament anywhere else. Then you may have to start getting real particular about getting good arch support in your shoes to keep it from coming back. I did, and you'd be amazed at the variability in that area among various brands of shoes. Some people have to have custom orthotics made. I haven't had to go that route yet, but a lady here at work has. I try to stick to Easy Spirit, SAS and New Balance shoes, they feel really good. Ariats do too, but they're really high. Otherwise, get some Dr. Scholls "Sport" insoles and put them in the shoes you already have. They have a big arch support, the others are just flat jell-type things.
I need to start with good shoes... Trouble is, they have to be good in mud too... I do half my work outside in slip on rubber boots without even a liner in them.
Oh well, the muddy season is nearly over I suppose, at least for awhile ;~D.