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@Greenbank
Postural Change Hypertension is common amongst people with a low resting HR too, I get it occasionally when my fitness is going well (I can usually tell I'm at this stage when I'm able to work out my pulse just by 'hearing/feeling' it inside my body, no need to stick fingers on wrist/neck/chest).
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When you stand up, gravity causes blood to pool in your legs. This decreases blood pressure because there's less blood circulating back to your heart to pump.
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And, the lower your heart rate at the time, the longer the gap between beats and the longer it'll take to get blood flowing up to your brain again, hence the dizziness.
If you know you're about to need to stand up then fidget about a bit to get the heart rate up. Or use it as an excuse to visit some of those sorts of websites.
Personally I wouldn't make any dietary changes to try and sort out the PCH as that's just a symptom of the underlying problem (low BP). If you're GP isn't concerned with your low BP then I'd just learn to get used to it.