Hi and welcome to Healthcare magic.Thank you for the query.
Of course that gastritis
and hiatal hernia are realted. Hiatus hernia
is probably the cause of all it. and oly surgery can improve your sympotms if medicines arent helpful. But surgery in your case may be complicated since there is probably excessive adhesions formation. So you need to consult with your gastroenterologist and surgeon about all this
Wish you good health. Regards