Lynney
so sorry you are feeling so bad. Unfortunately, when the side effects hit, no matter how much you have read and how many people have tried to explain, it is just so unexpected and ...awful. In answer to your question about which drugs to take - all of them (but not all at the same time

).
Take your pills in with you and get your doctor or nurse to take you through each of the drugs and explain what they are for and make them write it on a sheet of paper for you. We found that the labels stuck on by the pharmacy were often incorrect for our needs as they were computer generated.
I have spent my entire adult working life working with drugs and the last 10 years with treatments that are even more toxic than chemotherapy (except cisplatin which I think is the most evil thing ever put on this Earth but is also the one thing most likely to cure us in conjunction with radiation) and even I got it all tangled up with everything going on.
Please get someone to write it all down on one piece of paper so you can use it like a checklist. Get them to write the name of the drug (brand name and generic name), what it will help with (eg nausea,) how often you should take it (eg 3 times a day with food - and don't let the doctor write stuff like tds which means three times a day to him but absolutely nothing to you), for how many days and how many each time.
Alex often marvelled how "normal" people managed to get through it all without killing themselves. We had a really BIG piece of paper and Alex used to lay out the pills next to the name on my instructions so that he knew he had them all.
Your idea about sticking your fingers down your throat: The good news is that the cisplatin will keep working as it is already in your system and no where near your stomach. The bad news is that it isn't likely to make you feel better either. As far as the nausea goes, it will begin to feel better after a week and you will feel much better after two. However, DO talk to your doctor because it might be possible to control it better with more or different anti-nausea drugs. It is also possible to take a few things like steroids BEFORE you go for your chemo session as well as during and after.