For what it's worth, I had an experience extremely similar to yours just a few days ago: http://goedhartvoordieren.nl/?page=r/Drugs/comments/81w6dc/i_think_i_just_had_the_best_druginduced/
The last week (after ket) has easily been the happiest week I've had in months -- maybe years. I agree that there is an afterglow and I won't feel like this forever. But there's something about ketamine that does something for depression that nothing else does. It requires self-control to take it only monthly or bi-weekly, but the relief I experienced (and what you seem to experience) is incredible and I'm super happy for you. I hope as more people research this we can find the right balance to treat depression while avoiding any kind of abuse or false hope.