Feet Pain

So on my long run today I got intense pain in the arch of my left foot. I’ve noticed that my feet always start to hurt after 8-10 miles but it’s typically bearable. I’ve only ever used Brooks Ghost 15s. Should I get my foot sized/fit for shoes at my local running store or maybe some other hacks to help? Getting nervous since the marathon is 26.2 & I’m in pain by mile 8 today😅
Thanks!