Thanks for choosing health care magic for posting your query.
I have gone through your question in detail and I can understand what you are going through.
can occur due to many reasons. If you are not having fever then the antibiotic may not help you more.
One possibility that you cannot ignore is depression
. Depression can cause headache, malaise and nausea
. Especially the fact that most of the days you are well suggests that depression could be a possibility.
IN case if it is so then you should be treated with some antidepressants like escitalopram or fluoxetine
Hope I am able to answer your concerns.
If you have any further query, I would be glad to help you.
In future if you wish to contact me directly, you can use the below mentioned link:
Wish you good health,
Dr. Srikanth Reddy M.D.