Hi Dear XXX! I have gone through your questions and I understand your concern.
Yes
lethargy , truble sleeping are sign of
depression but does not mean that you have depression ,could be other causes than real depression.
In your case these feelings : lethargy , truble sleeping , heartburning( your stomach produce more acid under
stress having
acid reflux) are caused of you stressful situation .
It's normal that we feel stressed and depresed while going through difficult situation in our life
.But the important thing is that they will not effect out day life, in the moment that do could lead to depression. . If you have other symptoms such :feeling hopeless or worthlessness, difficult concentrating leaking decisions, feeling guilty, empty feelings ,sad ,anxious , loss of interest in every day activity or hobbies, problem eating ,irritability. ect.
Call your local doctor if you have any of the symptoms.
Wish you good health!
If you have any other questions please feel free to ask me .