Could a brain injury from 4yrs ago effect me today in balance. Vertigo memory insomnia I suffer from this from such a issue. Skull was fractured?

Neurologist. Yes. Depending on what areas of the brain were injured it can cause differing sequella. Please see a neurologist if you have not done so in recent hx.
Yes. These symptoms that you describe can certainly be long term sequelae of a head injury. The chance of this being related increases with the severity of the head injury. For example, patients with severe tbi may be susceptible to developing post-traumatic or normal pressure hydrocephalus (symptoms include gait, memory, bladder issues). This should be evaluated by a neurologist.