Interesting reading your post as I have just had my first FEC too! Actually it was a week ago last Monday . My experience was kind of similar. I managed to continue working, but i was so happy to see the weekend and then the diahorrea set in! The thing I found the hardest was waking up in the morning and analysing how I was feeling! It did my head in! But over a week on I'm feeling good, I'm so glad it's every three weeks. Now I'm just waiting for my hair to depart!
Good luck with the rest of your treatment. Xxx