A doctor told me that gastritis and acid reflux were separate entities :-/
However, in practice I think people find a flare up of one can aggravate the other.
I have gastritis and oesophagitis but I can't always separate which symptoms belong to which. I tend to associate a constant false hunger sensation and nausea with the gastritis element, but that may not be other people's experience.
New stuff: GERD, Recurrent cystitis/Overactive bladder
Lifelong stuff: Food allergies/intolerance, eczema, asthma