Q. How do I find a journal article on psychological illnesses?

That is a very broad topic, so you will want to select a narrower focus, such as depression, schizophrenia, etc. You might also want to think about if you are interested in the process of diagnosis, therapy or medication, etc.

To search your topic, go to the databases guide below and select the Social Sciences page. The databases listed at the top of the list are your best databases to try.  I would start with EBSCO: Academic Search Complete.

Select your topic, and enter it into the search bar. Once you get your results, use the limiters on the left for full text, publication date, source type, subject etc.