Hello Angel,
Sorry you're still struggling. It looks like anxiety to me, but Jenna is right, maybe gastritis is not just anxiety related, ask your GP to rule out H pylori. I was really sick for a long time before being diagnosed. After a course of AB+PPI+ranitidine I never had gastritis again.
How does the blood in stools look like? Is it red or blackish? If it is red blood, it's not from your stomach, it's from the last portion of bowels, rectum or anus, probably from piles. You say you keep losing weight, but are you eating properly? If yes, then you might have an absorption problem, irritable bowel syndrome, colitis or Crohn's disease.
In the meantime, try to address the anxiety. Mindfulness, tai chi, yoga, massage, whatever suits you, including anti-anxiety medication. Speaking of which, what medication are you taking right now?
Keep us posted, big hug.
Conolly X