Reddit mentions of Channeling: Investigations on Receiving Information from Paranormal Sources, Second Edition

First, RESPECT, for working with the dying and grieving. That is profound, and highly important work.

To reiterate other's here, you don't sound 'crazy', only opening to something that had value and an accepted place in antiquity and pre-modern societies (arguably it does now also, but not necessarily through any official institutions, it still seems to be a fringe activity and 'gift' not accepted by the sciences).

A starting point to placing your inner experiences into a broader context, which may help with self-understanding and integration through the process, might be:
Channeling. There are numerous other texts of similar material around. Check them out?

As to matters of grounding, other's advice here seems sound.
A somatic practice might prove helpful, like hatha yoga, or perhaps continuing meditation but practicing it in a different way, seeing as you are already meditating? Anapanasati, how to practice breath meditation, which focuses on the breath and thus has more of a grounding and bodily based attention brought to the process could be useful in this context. I've personally had trouble with dissociation and found sitting with a piece of obsidian and/or black tourmaline held in both my hands while sitting cross-legged or lying flat on my back, and focusing into the stone with my mind while being mindful to both my breath and body a helpful way of grounding and generating containment in/as my body.

Although the following book is primarily about working with energy healing it discusses channeling and contains diagrams of exercises that help a practitioner working with subtle forces to stay grounded and balanced, it might also be worth your time Hands of Light.
Salutations!