I get the nihilist feelings. When the panda petting paradise is your world and then it gets taken away there is a deep sense of loss and hopelessness. Its easy to fall into a sort of despair and nihilist feeling without the eternal reward to bank on...
Before making the radical choice, however, remember: the option to forgo life will never go away and, all too sadly, it will be your end anyway.
Give life a chance.
Life is for living and the wt ingrains that this life is temporary and its something of an "investment". You give up pleasure now and get the return of paradise and pandas yadda yadda... the truth is this IS life and we have the ability to make the best choices we can to enjoy and ourselves and leave a better tomorrow for those we care about. Its not temporary in your life. Its always good to look at the long term but dwelling on the ineffectiveness of your 80 years compared to the earths billions years is getting lost in the big picture. No extreme view us beneficial. Keep a macro and micro view but live in this moment. The next isnt promised.