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Can't stop being sick even though stomach empty, what can I do?
Each to their own but the trouble with drinking loads at once is that you are more likely to vomit it up (I know you are vomiting a lot anyway)
Try sipping tiny amounts at strict 15 mins intervals (use timer). You can honestly get quite a lot down that way. Try tepid boiled water (less of a shock to the stomach than cold water) flat coke or flat-ish lemonade or rehydration powders from chemist.
If it goes on for more than 48 hrs or your urine gets very dark; seek medical help.
Can someone get to the pharmacy for you? You should be able to get something for this. I'm not in the UK so brand names are different but if looks like something called Buscopan is the same as what I've been prescribed. I'll try and link to it but a pharmacist should be able to help. It's honestly brilliant and was the only thing that helped me get some rest.