Cancerous polyp in stomach

[Coco25]

Hi there. I have been having gastric problems for many years but this year I was told I had calprotectin (protein in the poo). I managed to clear it up by removing certain foods from my diet and taking turmeric tablets, etc. At some point I started having discomfort in my stomach despite having an x-ray, colonoscopy and scan to my stomach on August/September nothing was found. Last month I had an endoscopy and this week I was told there is a small polyp which has been confirmed as cancer. I have no idea how far advances it is but I have to return on Monday 9th Dec to have another endoscopy to remove the polyp. I have no idea what to expect or what to do after. Any advice will help. Thank you.