mm12 and weezie85, welcome Congratulations and commiserations.
mm12 definitely go to the hospital. If you cant face firday evening then first thing tomorrow. If you get blurred vision or headaches or dry skin that you can pinch upwards and doesn't return into place properly or mental confusion, then do go tonight. Those are signs of real dehydration.
It sounds like you need stronger than cyclizine rather urgently. Have you got a partner who could print out the NICE guidelines that Lucinda linked above? cks.nice.org.uk/nauseavomiting-in-pregnancy They have a summary of the safe meds that can be used.
(mother hen not sure the link in the op is working, actually)
weezies, is your doctor sympathetic? it might be a very good idea to see if you can find a sympathetic one and plan how to handle the sickness, like mother Hen says
Might you be able to find childcare for little weezie? Rest, rest, rest helps.
glitterball lovely to hear your son is doing well =) if you are TTC again, it might be a good idea to plan with your doctor how to handle treatment if HG recurs. Unfortunately, it often does :/ Is your doctor sympathetic?
bugista ouch about the near-pee ... Tena lady? I resorted to that 
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ruby very nice to hear from you and glad you can look at all the indignities and pain with humour!
how are you doing amys? :)
wishing everyone a quiet night and no, mother hen, the children are not behaving the older one is showing the effects of returning to school and Pipsqueak has just learned how to climb out of the child-box (forgotten what they're called in the UK, 2m square barred cage about 1m high, the little bugger climbs out of it now so there's nowhere to keep him out of the way for 5 mins!)