Yes, it is scarey having Chemo, especially that first dose. So sorry that you are facing this too!
I have had 3 x FEC and am 2 weeks away from last of 3 Docetaxels.
As you have probably heard everyone is different with side effects. My experience with FEC was not too bad. Never vomited but felt various degrees of nausea. I found it helped to eat small amounts regularly. Sometimes salty foods are more appealing. I also found cold food easier than hot food. I also felt pretty tired for a couple of days. Generally I felt better after day 5 or so.
I started to lose my hair about 2 weeks after first dose of FEC, although it took ages to actually lose it all. I had it shaved to minimize discomfort and mess. Remember it does grow back!
Make sure you look after your mouth care to avoid ulcers! I used a 1/2 teaspoon of salt in glass of warm water to rinse and gargle with. Do this after you eat and use a soft toothbrush to brush with.
There is a blog on here called 'things that helped you through Chemo' or something like that which had lots of info on what people have found useful. Just type chemo or things that help into the search bar at the top of this page and you should be able to find it.
Wishing you all the best for first Chemo. If you have questions as you go just come on here and ask for help. We are all here to make the journey easier if we can.
xxxDeanne