Hi Cody,
It is possible to have out-of-body-experiences (OBE’s) as a result of practicing yoga and especially as a result of a kundalini awakening. You will come back though, even if it does not feel like it sometimes. 
Many people have such experiences, but they do not die.
In terms of staying grounded, you have been given good advice about that by Charliedog already in this thread.
You are going through a particular stage at the moment. It will pass, and then you will be onto a new stage, with new experiences unfolding.
It will be alright!
Christi