Ge junction cancer. Chemo hell worsen.

My dad has cancer biopsy- adenocarcinoma at ge junction. He has bp. Pet cet results came. Im not able to attach more than two documents. Please guide doctor told stage 4. Doctor told some in neck, multiple lymph nodes, ge junction He looks completely normal Only slight stomach pain Hes active, talking, walking, working. Eating normally. So one doctor i visited told its spread everywhere. Whereas its not spread to other organs. Only lymph nodes. Its in ge junction . primary sources. Doctor told only chemo after blood test hell say which chemo. But 6 session of chemo every three weeks. He told it might grow everywhere. Probably might not able to eat after 6 months. And survive only 8 months or so. Il attach report. Please guide its only in ge junction. But some in neck. Some swelling in lymph nodes. No other solution along with chemo. Like radiation or immunotherapy. Now atleast hea active. But im scared after chemo hell worsen.