In reply to OneLifeOneHeart:
Get an assessment done by a podiatrist.
Here in the People's Republic of Scotland, this is free. If you need orthotics, then these too are free, if you go to an NHS podiatrist.
Of course, you can go private.
Consequences?
That is like saying I am ill, what are the consequences?
How fat are your feet? Is the situation stable, improving or worsening? What is causing this? What are the effects when you walk?
As for me, I have been wearing orthotics for about 15 years now.
The consequences are: it is really hard to find footwear that fits. And that includes things like trying to find sandals where the orthotics don't just slip out the back as I walk - no flip-flops for me.
Other than that - I am heading back to the Himalayas for the fifth time this summer, leading a trek in Ladakh and then heading off to do some climbing. So I don't feel that having flat feet has held me back TOO much