How many have you have had it where you feel uneasy away from your loved one, perhaps in the form of stress or fear or a physical expression of that?
A Course In Miracles says that one particular cause of sickness comes from the perceived idea that we are separate from our ‘brother’ and from our collective Source (God/Perfect Love/Divine Source whatever you want to call It).
And indeed, if we identify with the idea that we are a body, temporary and with a finite shelf-life (rather than with the fact that we are Eternal Love) the idea of separation can be felt very acutely.
One way around that is the follows:
(a) recognise the sense of separation is nothing but an illusory veil, a mist in the mind, not really there ~~ that we are all connected through Divine Source
(b) we can then bring Divine Love in to the sense of ‘separation’ to heal it.
Keep doing this til the veil is dissolved.