I'm not a medium, but I've often felt like communication with someone in spirit is like trying to speak someone underwater, in a foreign language, so I get SL's analogy. I've had to come to understand that communication is about more than words and speech, and I've had multiple overwhelming experiences that have confirmed to me that this person - and obviously by extension - everyone else who's passed - is still conscious and still exists, so I'm happy with that. I think I've had to let go of any (understandable though it is) mortal human need for any sort of "message" or anything. I mean, what else would I need to know? I know that xxxx is still around and okay, so that's enough for me.
I once said to xxxx, "You know xxxx, sometimes it feels like you're at the other end of a bridge from me, that's shrouded in mist. I can't see you, but only every now then I get a glimpse that lets me know that you're there". By glimpses I meant metaphorically, the experiences I've had.
Now, I didn't for one second intend that as a "give me a sign" plea or anything, it was just musing iyswim. In fact it temporarily slipped my mind that I'd said it. Then, a few days later, late one night, two really "in my face" incidents happened, to the extent that during the second incident I started to get slightly nervous for the first time in years. Bear in mind that by this point I'd had objects both fly across a room and drop down out of the air in front of me, so I wasn't easily fazed.
Anyway… it wasn't till a couple of days after that I recalled what I'd said about the bridge. Then I realised that I'd simply been given a particularly powerful confirmation that xxxx is very much still here. After that I lost any fear completely, and knew I had nothing to be afraid of.
Similarly, there was a time when I'd received some really upsetting information relating to xxxx from one of their close friends, I mean, really sickening, gut wrenching stuff, and I was really shaken to the core.
Now, usually if something as major as this had happened, there would be sort of sign from xxxx a few days later. I didn't demand or expect anything, but just past from past experience that's what would happen.
Anyway, after a few weeks, I spoke to xxxx, said I was getting a bit concerned, trying not to make it sound too much a plea. But a few days after that I got a "heads up". I didn't realise at first, and was starting to get confused and frustrated with what was happening, then I suddenly thought, hang on a minute… and said out loud, "Is that you doing that, xxxx? "
And immediately it stopped "Yay! She's got it at last! " thinks xxxx. 
So anyway, I think the crux of this is that I feel a lot more calm and trusting. I know with 100% certainty that xxxx is still around, and I'm so grateful for that.