MY HUSBAND HAD SHINGLES ,A FEW YEARS LATER HE BEGAIN

MY HUSBAND HAD SHINGLES ,A FEW YEARS LATER HE BEGAIN HAVING UNBAREABLE PAIN IN SIDE HIS HEAD.THEY TOLD HIM AT THE VA HOSPITAL HE HAD SHINGLES IN SIDE OF HIS HEAD.THEY PUT HIM ON MED . THAT MAKES HIM FORGET AND IT SLOWS HIM DOWN,HE IS NOT HIS SELF. HE TOOK THE MEDS FOR A YEAR OR SO AND THE PAIN STOPPED BUT IT CAME BACK SUDDENLY EVEN THO HE IS STILL ON MEDS.IT THERE ANYTHING THEY CAN DO TO HELP HIM ?