It definitely sounds like your already existing anxiety, coupled together with the uncomfortable feelings that attending the wake brought on has left you symptomatic.
Use your coping skills to help you decompress, and I am sure you'll be feeling better tomorrow.:)
"Courage is not the abscence of fear, it is feeling afraid and doing it anyway!"
"Worrying does not empty tomorrow of its troubles...it empties today of its strength."
Corrie Ten Boom
Panic Syndrome recovery due to CBT