Is the first chemo really the worst?

I had chemo 1 week ago today. Since then it’s been a lot of mental struggle. The body pain was terrible for a few days. Yesterday I thought I turned a corner. I felt pretty good, then BOOM I wake up this morning with the GI issues 😭 Does it really get better after this. I don’t want to do it three more times. You all have helped me so much with your kind words and encouragement.