Grounding is a fundamental to safe and supportive spiritual practices in all instances.
Regarding working in a mediumistic way – do not seek to always be in the company of spirit – you are in a physical/material world, honour and devote time to your spiritual work as well as your physical life. Be disciplined about when and how you work. This will preserve your energy as well as ensure you are more focused/productive in your committed/dedicated time.
When you meditate or seek to develop your psychic abilities always do it with the highest intention for yourself and others and when you are complete, ground yourself back in reality. It can be as simple as drinking a glass of water or walking barefoot on the grass or visualising your feet in the earth. Just think of it as your mind and body need that security and centre, if you open a door close it afterwards. Maintain balance.