Hello Interloper!
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The hardest part is the filling of the balloon with Saline, which seemed to take forever but was probably only around 7 or 8 minutes in reality.
I drove home myself, all was fine and around an hour after the procedure, it started to feel like a heavy weight in my chest so I retired to bed early, took some buscapan and thankfully food was the very last thing on my mind. I remembered to keep sipping water or squash to keep hydrated so I made sure I did that.