I'm so sorry to hear of your suffering. I don't want to sound condescending, but are you waiting until nausea and sickness kicks in before taking your anti sickness meds? If so, take them before, and hopefully they will prevent it happening. If the meds just aren't working, ask your consultant if you can have Emend - which is gold standard for anti sickness, but not offered straight away as it is expensive.
The following thread has lots of hints and tips for chemo, and also has advice about food:
Another suggestion is to join one of the chemotherapy monthly threads, where you will join others going through the same thing as you:
Look for the month closes to when you began your chemo, or simply join the latest one, which is "Treatment starting August 2014"
Good luck for number 4
Welcome to the forums.
As well as the support you will receive on the forums we also have a free helpline where you can talk things through with a member of staff who are there to offer emotional support as well as practical information. The free phone number is 0808 800 6000 and the lines are open Monday to Friday 9.00 to 5.00 and Saturday 10.00 to 2.00.