Laughing or crying at weird times?

Before I get any comments on this, I don’t have PBA. (That’s the neurological disorder that the Joker had in the new movie). I don’t laugh or cry at any time. But whenever something is going on with my body and I google my symptoms, I often laugh or cry while reading WebMD. Also, right after I get a flu shot I start laughing and/or crying. I do not feel scared when these things happen, I’m not afraid of flu shots, I do get a bit nervous though. Also have suspected that I may have GAD or social anxiety, but my symptoms aren’t often enough that I feel like I could be diagnosed. If you have any idea why I do this I’d appreciate advice.