Isn't it strange that ppl with flat feet and pple with high arches both need arch support?

From what research I've done this seems to be the case. I have odd-shaped feet, very skinny in the back near heel, and wider in front (near toes). It seems to me that this leaves me little surface area on which to support myself. I am thin not overweight. I allso have a high arch and they hurt and lately its difficult to walk. When I'm sittin/laying down my arches spasm. I fear I'm not walking correctly and could be causing myself bone/posture/other issues. My feet aren't flat but arch supports help. However, the kind from a general store are not supportive/(high?) enough for my feet. does anyone else have this problem?? I also fear fallen arches which I'm not really sure what they are. Help!