I have had two episodes that knocked the wind out of me and can't quite figure out how to approach this -- let alone address it.

1st - (5 years or so ago)I have a habit of sneezing loudly and explosively.  I can feel my whole body engage and release.  This time, I had multiple sneezes and in doing so, I passed out.  Alone at home, I was lucky not to hurt myself falling onto the floor and woke up later - I don't know/remember how long I was out.

2nd - (10/29/16) I was having dinner with my team.  The room as quite hot and I was eating a piece of fried-perch which was dry.  I started coughing and it was multiple without a break -- and passed out!  Within 15 seconds, the folks with me woke me up but I was completely out.  I remember handing the plate to my wife and wanting water...that's all.

Any inside on this -- the last episode freaked me out as I am older wanted to understand this better.  

Thank you!