What causes people to get words mixed up for example. .. paking tictures i do this a lot?

Spoonerisms: Many people do this on accident or on purpose for humor. See: http://en.wikipedia.org/wiki/Spoonerism I would not be too concerned about it. Just one part of your brain works faster than another part. The picture is of the Reverend William Archibald Spooner (1844–1930), Warden of New College, Oxford, who was notoriously prone to this mistake. Although some claim his students made them up.

Brain malnutrition: B12 is a necessary entity for your brain and nerves. If you are deficient in B12 and folic acid for a time you not only can get numbness and tingling which you describe but also memory and recall problems as well as word mix-up. Stress or strategically located small strokes can cause the kind of problem you describe as well. If you are not already doing so, you should see a neurologist.

Dyslexia: You may have expressive dyslexia. You will need an initial neurologic evaluation for any organic pathology. You will likely benefit from speech therapy.