Sorry you are having nausea. The only natural remedies I know are ginger tea and sea bands, but I have no personal experience with either.
Re: your ears...... The pain could be from allergies. The swelling from allergies affect the draining tube from your ears to your throat (can't spell it-eustachian tube?) and it can trap air bubbles and/or water and cause a lot of pain. It can also cause vertigo. First try clearing you ears a few times as if you were on an airplane for immediately relief. Then try some OTC allergy or sinus remedy. There is a med for this called antivert, but it makes one very sleepy.
UC diagnosed 10/05, first symptoms 1983
canasa and lialda daily
Trying out Digestive Fitness Probiotic