How are you doing mentally? Depression and anxiety can cause loss of appetite, quite easily.
If you have acid reflux problems, there could be some underlying gastritis (even if you don't feel any stomach pain). This is not to get you anxious or anything, I'm just offering up reasons for your lack of appetite.
I've had a very noticeable lack of appetite (and weight loss) over the past couple months due to chronic gastritis (partly due to reflux), anxiety problems and depression.