The most common cause of nausea and feeling tired after dialysis is the low blood pressure that occurs as excess fluid is removed. It is essential that you tell your team about how you feel so that they can try making adjustments to the fluid shift levels.
The other common problem is that people drink too much fluid on the days between dialysis so it is important to keep to your limits as this reduces the swings that you will see from day to day.
Less common causes can include an intolerance to the dialysis process itself, or other problems such as anemia or chronic infection. So in order to find out what is happening, your team need to have a thorough review of your stats and look at ways of making adjustments.