I am extremely sorry for your mother's demise, but you have told "just" but not how many days back. so I am not able to access the interlink of Your mother's demise which might have produced tension - leading to your complaints.
Your complaints are severe Headache
, loss of appetite, dryness of mouth Diplopia
and low grade temp. There is a wording in our studies " If you think commonly you are commonly correct"
So don't confuse yourself with your mother's illness. Consult your family Physician, Investigate and get treatment accordingly. If I start to say what may be the causes for your individual complaints you may get more confused. Think nothing will be there - nothing to worry will be there.