I think that it is human nature to use whatever information we can get our hands on when we are worried. Before Google, people went to the library to look up symptoms, and there were numerous 'textbooks' aimed at the lay reader - I remember their being very popular when those Book Of The Month clubs were in vogue.
I am currently waiting for tests that could turn out to show something very worrying, and I have Googled - of course I have. I know I shouldn't, but I couldn't resist, and no, it hasn't helped my state of mind at all.
I think that mostly we do it in the hope that we will find something that will reassure us that things will be ok. That's not what we are likely to find, of course, as most of the articles will be about the prognosis or management of conditions, not about false alarms.