My head's hurting.s My head hurts

It seems like there's something wrong inwith my head, sometimes it feels like someone knockhit my head bywith a hammer. It seems like there's something wrong with my head, sometimes it feels like someone hit my head with a hammer.

Not sure if the comma there is correct or not. But a period would work. With a hammer I would say hit. You might use knocked for like "It feels like someone is knocking on my head." But the hammer version feels more 'usual.'

It seems like there's something wrong inwith my head, sometimes it feels like someone knocked my head bywith a hammer. It seems like there's something wrong with my head, sometimes it feels like someone knocked my head with a hammer.

I don't really know what to do, couldwill tomorrow be better? I don't really know what to do, will tomorrow be better?

I think 'could' would work, but it sounds a bit unnatural to me. I would probably say. "will tomorrow be any better?" Not sure exactly why, but it sounds more natural to me.