Contact the doctor overseeing the trial IMMEDIATELY. I don't care if its the weekend, you need to let them know asap when in a trial if you have a day like that. It could be a common side effect that they can tell you how to deal with based on the drug companies information. It could be more serious and they might want to see you immediately. I personally think you are probably ok, but as I said, with a clinical trial you can never be too sure, and all of these things do need to be reported so they can investigate any and all side effects to be sure this drug is safe enough to make it to market. Also, make sure its ok to take the anti-nausea meds while on the trial. There are sometimes exclusions to other drugs based on the biology involved in how a drug works or is metabolized, though in the case of a biologic it would be a bit more complicated and less of a risk, you should still ask.
Good luck and feel better!