Weak ankles & Foot spasms

I’ve walked on the sides of my feet all of my life. That over time the heels of my shoes will wear off a complete diagonal section. I have pain in my ankles and around my heels constantly. Now its developed into spasms that start with my foot upto my ankle where I can’t move it all for up to 15 minutes. My knees are always in pain & swell easily so I was wondering if I could get better support for my feet & ankles if that would relieve these symptons.