Oh, yes, I have been able to get easily overwhelmed for a long time. Too much of any kind of sensory stimulation will do it to me. I used to put it down to being hypersensitive. Since being diagnosed with ptsd, however, I've learned this is common with us. Be patient with yourself. I was diagnosed a couple years ago and I'm still coming to grips with it at times.

Also, the "ptsd cup" post that Veiled mentioned is in the Information section under Anger Management: The PTSD Cup Explanation

I never think to look for it there, because I get the overwhelmed stuff more than the anger, but that's where it is.