Eating help

hiiii I've been suffering with what I believe to be gastritis(diagnosed with stress gastritis in the past which felt exactly like this, don't have the money or insurance for testing currently) for the past 50 days. I've lost 21 pounds already and have finally been able to start eating a bland super strict diet and I've been feeling much better but I'm still barely getting 300 calories in a day because I just CANT eat more than a small bowl of chicken and rice and a slice of toast. Does anyone know of anything I can add to my diet like baby foods or meal replacement shakes to help me get a little more in? I'm feeling so weak and just want to be able to eat more than once a day