Lat arch and ankle pain after long run

Hi all, I'm looking for tips on what to do after seemingly injuring myself during a run. Didn't feel anything out of the ordinary during my 6mi run yesterday but feel strong pain under my left lat arch and ankle. Hurts to walk. I was hoping to get a few more long runs in before a March 2nd half but maybe I should take it easy. Any tips or experience dealing with this?