History noted. The headache and eye ache is because of jet lag. The symptoms of this being Headache, fatigue, insomnia
, irritability, depression
or at times diarrhea
. Now a days corneal transplantation
is done with good quality of suturing material, which will heal in few weeks time post surgery.Hence nothing to worry about the corneal transplantation, but kindly do a yearly eye check up as a follow up. For this jet lag, ask him to take rest for 2 to 3 days, after a good sleep he will be fine. If not get him examined by your physician and follow the medications as prescribed.