Thanks for your question.
You have lot of stress
in your life one is your boyfriend affair,your psychical abuse,His bad behavior that all lead to a problem of adjustment disorder
develop in you where you are not able to handle small decisions,action of your life .And you have mild depression
in you too and that is very usual in your circumstances.
So why you wait here and become tortured.God is thankful to you that you have a services so try to deeply involve in your job and immediately leave the person.If you want you can think for a new life also.start at least a daily activity schedule,involve yourself in social,familial matters.
In the meantime if you think you can consult to a psychiatrist
and take a counselling
as i think you don't need any drug but i think to leave this person house you don't need opinion of any doctor.
Dont feel yourself alone.we are all with you.
Dr Sourav Ganguly