How can I control my repetitive negative thinking when I'm feeling anxious?

Stop and focus on your breathing. Put your hand on your abdomen and concentrate on your breathes going in and out. Breathe and breathe and breathe until things stop racing. Then get a piece of paper and write down each thought clearly. Then rationally argue the reality of each one.

One can control repetitive negative thoughts by talking about it to someone or having a positive outlook, i.e. by looking at the other side of the coin.

There are many different ways but I would say the best way is to talk to someone you trust. Or just distract yourself.

Trying to think of things that make you happy can help.Or trying a breathing technique,being in a room or space in which you feel most comfortable. http://www.adaa.org/tips-manage-anxiety-and-stress

The best is to challenge that negative thinking by questioning the negative thoughts. Ask "so what if this happens?", "how do I know this is going to happen?", "what is my evidence for thinking this way?", "could things be different?", etc. Question, question, question negative thinking.

Begin to question your negative thoughts with logic. For example: why am i having these thoughts? What are the chances of this actually happening? I know this is just anxiety so why worry?

Try as best as you can to fight against them. Like having an inner voice that says mean things to yourself, try creating an inner voice that says sweet things to yourself so it can battle against the negativity. And know that your anxiety is a misguided way of trying to protect yourself, meaning it wants what's best for you but because you've been burned before, it's trying to take care of you so it won't happen again. But know that you need to take some chances to feel alive and to go against the negative thinking you've created a habit of having.

When I feel like that, my thinking is often based on a projection of a POSSIBLE bad outcome rather than an ACTUAL bad outcome. In those cases, my preferred approach is to talk to a close friend about it, get it off my chest and have them listen to me. Saying it out loud to someone else often leads me to the conclusion without their help! When that's not possible, I find writing down the problem along with a mind map of related thoughts and issues often helps. Seeing it on paper, I can think about each element in a controlled way without constantly looping out of control, only moving on when I've "resolved" it or reduced the extent of that worry. Once I've thought things through and contextualised POSSIBLE bad outcomes, I'm usually feeling better.

Its in your hands to control your thoughts and emotions. Say it out loud in your head till it becomes clear to your mind that it is actually in your hands to control your thoughts. Negative or positive. Believe that you are the owner of creating them within you, gradually this will become a habit that whenever the unwanted thoughts would arrive you would look for the ones which are positive. I am no professional. I just believe it to be true. You can give it a shot. Don't over exaggerate anything in your mind just go easy on your self. Take charge of it. If one says that this or that particular thing is not in my control then they would never try to own it. Thoughts too are like clothings they are worn by us the way we wear clothes, we chose clothes in market out of various options there are pretty and there are not so pretty clothes in our eyes, you chose the ones which appeals to you or the ones you need the most. Mould your thinking this way. It can help you too. Please tell me if it helped. I would like to know if it did or didn't. :* be your own fashionista in your head with thoughts.

Practice, practice, practice. It can be hard to get out of thought patterns, but don't aim to control them. Have them, then let them go. It's not easy, but with practice it gets easier to bust out.