Have you ever consulted a psychiatrist for this problem?you said you took treatment for it,assuming that you visited a psychiatrist.it takes time for the medicines to act to reduce the anxiety you experience daily.i know how you are feeling,the negative thoughts dont go unless you stop ignoring them.They are just thoughts,we can not control what comes in our mind.Things nearby,situations that you are in quite have an effect on the thoughts.So try to think in a way where even a negative thought is coming in your mind,try to seek something positive,laugh at the thought,it all depends on your will.how much importance to give to what thoughts.Because in the end you know thats just a thought not real thing.It can not control you.you need to learn to manage your mind.Psychotherapist can suggest you better ways to deal with the thoughts or anxiety,depression.It takes time.Go for few counselling sessions,talk about it,understand things,it definitely helps.Most important do things that bring joy,happiness to you.do meditate every day.Learn the right way to meditate,do it daily it will definitely help.take medicines on time given by your doctor,if you have doubts ask the doctor,tell what is your condition after taking the medicines if its helping or not.I am sure the doctor has answers for it.The doctor will sure help you,talk about it.feeling stressed and depressed is very common these days.Fight against things that bother you.And i konw you will come out as a winner one day.it depends on you,believe in yourself that you can do it.