Hi welcome to H.C.M.Forum. fundal gastritis
will not take so much of time. there could be some other associated disease like gallbladder
stones or hepatitis
i suggest you to consult a gastro enterologist fof diagnosis. you may need to get the tests gastroscopy , u.s.scaning.blood tests SERUMBILIRUBIN, HBSAg done for confermation.
besides i advise you to follow diet controle. avoid spices, chillies, fries, junk foods, sour foods &fruits. use more of curd with food. wishing for quick recovery.