Yes, it is very scary. Think of all the horrors you have seen on tv and in the movies about chemo, and no wonder we are scared! But most likely, your experience will be NOTHING like that. None of us can tell you what you WILL or WON't experience, but we can tell you our stories. Figure you will have a little of all our collective experiences.
The fear of the unknown first treatment is usually worse than the actual treatment. There will be side effects from chemo and from the meds, please let your doc or RN know becuase they may have more that they can do to help you.
In my case, I did AC chemo, 4 times. I felt pretty good the first day, went out to eat lunch after, and got nauseous around 10 pm, vomited once, and that was it. No more nausea and no more vomiting (and no more out to lunch!). I was tired for the first couple days, and a little restless from the steroids. On Thursday (chemo was Tues), my voice faded and water tasted funny. On Friday I got acid reflux, lasting a few days. That is it, no other real problems....I took off work Tues and Wed, worked half days Thurs and Friday. The pre-meds can be constipating, so you may want to ask about taking a stool softener or something to help out.
My onc advised me to keep active and walk a lot, so I did a mile a day (in winter in Michigan!) and it helped me to feel normal.
Hang in there!