What did you have to eat/drink at the bbq? Was it the same or similar to what made you wake up with the sour stomach? Do you have any food allergies? Might wanna get that checked out because the loss of motor skills, sudden decrease in hearing and vision white-out sounds exactly like what I experienced in the hospital when I was accidentally given an IV of a medication I was allergic to. This happened right before I went into anaphilactic shock- a symptom of severe allergic reaction. Although, an allergic reaction like that is usually immediate, and I'm NOT an expert! You might wanna go to your allergist and get a screening done (if you haven't found a cause yet...)
If you drink coffee, stop NOW. Only drink fresh juice.
strongly recommend you see the doctor for this, especially with it happening the second time only with more intense symtoms. Let us know how you are. Get well!
you really should go to the doctors,when you say you collapsed on the bed do you mean you passed out?