Is the itchiness related to the reflux? I get this with allergic rhinitis which is a totally different condition. Wake in the night with tongue scratching the roof of my mouth and behind my teeth
Have you tried raising the legs of the bed so that your legs hang down a little, therefore raising your head - I found sleeping up on pillows didn't work because I slumped over eventually and the heart-burn woke me
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Also smaller, non spicy meals might help. Keeping the stomach with something in it to soak up any excess acid. When do you take the Omeprezanol? DH used to take 2 tablets at breakfast and that helped reflux for him. I don't think you need gaviscon as well as the above.
I find that Milk of Magnesia is equally useful! especially the milk rather than the tablets. Or Rennies ;-)
If your symptoms are keeping you awake you will be weepy from lack of sleep!