Welcome to Healing Well! Glad you've joined us, but sorry you're feeling the need! I hopped online to look for information that might be helpful. Here's a link to a PowerPoint presentation that provides plenty of non-cancer causes of gastric wall-thickening.
You'll have to close your eyes and scroll through a bunch of cancer-related information, until you get to the "Benign Wall Thickening" section. Many people on this forum are likely to fit into many of the categories it discusses.
Don't do the cancer-worry thing to yourself. Even this link many create anxiety as you imagine all sorts of terrible causes. Don't waste your precious time, energy, and health, worrying about this unknown. I have no doubt that your GI doc will be on it...looking for the cause.
Once you have your endoscopy you'll have a better idea of what's going on. Until then keep yourself busy doing things that you enjoy and when you find your mind heading toward those worries, turn it right around!
Let us know what you find out!
We're here to listen and offer support.
Words of wisdom by Eckhart Tolle:
"Whatever you fight, you strengthen, and what you resist, persists.”
“Worry pretends to be necessary but serves no useful purpose”
“Accept - then act. Whatever the present moment contains, accept it as if you had chosen it. Always work with it, not against it.”