You will be given anti nausea medication to help relieve any side effects and usually will also have this medication available between treatments. Not everyone gets nausea. I was never sick and never felt sick, others get varying degrees of it. Staff can and will help with what to do to relieve side effects so always ask. As Molly001 says it's really hard to tell until you have had your first treatment or two. Then you can probably determine a pattern. Often people can feel a bit unwell for a few days, then recover in time for the next dose!! If you have someone who can accompany you for your first treatment, that's always useful just in case you have any reactions. Most day oncology clinics will offer tea and coffee and sometimes sandwiches. Very best wishes.