It's actually very common to hit your head again after a concussion. Not being fully recovered, you aren't as stable or alert, which makes you more susceptible to another bump on the head. It happened to my son and I've read many similar stories. Don't beat yourself up over it, just keep plugging. Recovery basics are the same though. Eye and vestibular therapy, diet and supplements. I always recommend books by Daniel Amen and Dave Asprey. Tons of useful information there. Dale Earnhardt Jr.'s concussion book is great too for describing the vestibular and eye therapy he used.

You can do this.