Actually a tickling at the back of the throat (acid
and then trickling down), throat closing up
, gasping and all opening up again can be due to reflux. You raise the head end of bed while sleeping and see if it helps with early morning choking.
The other possibility is gelastic seizures. These are seizure triggered by laughing and include fainting, shaking, stony appearance, head falling back, proper seizures etc. You need to consult a neurologist regarding this.