Flat Foot Pain

I have a flat arch and the pain is so great that I could not even go to the gym today. Everyone knows to manage this pain please?

You can get my shoe fiencee has the same problem and that works well for him.

I received an article that talks about the foot pain that may be useful in your case, take a look at the
http://www.healthmad.com/Conditions-and-Diseases/Relief-Foot-Pain-Caused-by-Plantar-Fasciitis.613965 Flag

Sounds like you have plantar fasciitis. The group that runs the length of the bottom of the foot may be inflamed.

It may be most severely tested, but if it continues, you should see a podiatrist. They will check and tell you for sure.