Help needed with Panasonic DMC-FZ200 please!

Hi there!
I am fairly new to the world of digital cameras, and am having an issue with the Panasonic DMC-FZ200 that I purchased quite recently.
I am trying to record videos for a small blog I am making, on behalf of my company. I have bought an external mic, which seems to be working fine, as does the camera itself. The issue I'm having is trying to listen to audio whilst I am recording a video, just to know it's fine at the time of recording.
I tried using a headphone splitter with both my external mic and headphones plugged into the mic input, but this didn't work (I appreciate this wasn't a good idea now, but at the time I thought it would work).
I also tried using a mini HDMI to VGA adapter, plugged into the mini HDMI port, as the adapter has a 3.5mm jack for headphones. However, when I try to record video using this with the internal mic, I can't hear anything, and when I try to listen through the Playback mode, it says 'TV output enabled' or something similar.
I don't know if this is an impossible dream, but if anyone can lend any assistance at all it would be much appreciated.
Many thanks!

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