I felt exactly the same way about day 4 of my first chemo. I remember thinking how am I going to do this again and again? Don't spend too much time on this. You will probably start to feel better in the next couple of days. Day 4/5 was always my teary emotional time as the steriods worked their way out of the system.
Know that you will start to feel better soon and then build on this with a bit of exercise which will keep you moving upwards too. It does get easier as you start to get into the routine of one off week, one bit better week and then one really good week. You will not feel bad the whole time! I am pretty sure you will find the PAC has different side effects which will be more bearable. Hope you feel better soon. Deanne xxx