I am sorry to hear you are challenged with confused thinking. When we are worried or anxious we can tend towards negative thinking as our brains try to make sense of what is happening.
There is a saying that 'the mind makes a great slave but a terrible master.' In other words when we find ourselves constantly thinking troubling thoughts, the mind can run away with itself and get still more confused and more anxious (hence it makes a terrible master).
Thinking tends to just lead to more thinking and a good way out can be to refocus and do something differently e.g. Give your brain a task to achieve, spend time pursuing a creative hobby, go for a walk in nature and change your environment, do some exercise etc....this can help us regain objectivity, get into the present moment and stop the inward thinking spiral.
You may find my blog post - Is rear flooring you or is it false evidence appearing real - useful for ideas and tips on how to help overcome such challenges.
This blog too may help a it talks about ways to look for inspiration when thoughts are bringing you down - Want to change your troubleome view.
I am a firm believer in positive, solution based thinking too and would certainly recommend choosing one or two positive affirmations to add to your daily routine.
However, do be patient with yourself but persistent because it can take time to change old thought patterns.
If you continue to struggle you could talk to your GP and ask if the surgery can offer a course of Cognitive Behavioural Therapy which helps tackle unwanted thoughts. For more information visit: http://www.nhs.uk/conditions/Cognitive-behavioural-therapy/Pages/Introduction.aspx
Life Coaching and NLP are two other methods which help the individual to seek solutions and discover helpful thinking processes. Here is another link for you: http://www.lifecoach-directory.org.uk/content/nlp.html
I hope you find the way that works best for you to unravel the confusion.
Do come back to me if you have any further questions.