The side effects you have will depend on the type of high-dose treatment you had. Most side effects are worst when your blood count is at its lowest. This is usually at the end of the first week and throughout the second week after high-dose treatment. When your blood count goes up, the side effects will start to improve. You will be at less risk of infection, your appetite will improve and you will start to feel better.
You will have medicines to prevent or reduce side effects. Always tell your doctor or nurse about any side effects you have. They may be able to change the medicines you are taking to ones which will work better for you. Your hospital team will give you more information about what to expect.