I was walking across an intersection. Thought I missed a pot hole in the street. I didn't. Fell sprained my ankle and hit my head so hard on the pav

Yes you can.  The first thing I want to say is document the evidence.  Take photos, video, get measurements etc.  Road maintenance is an exception to the sovereign immunity rules here in Ohio.  You still need to prove negligence, but that's true in any injury case.  Get an attorney on your side.  He or she can make sure things are done properly and help you receive the compensation you deserve.