Pennies, I'm sorry you are having a rubbish day, if its any comfort, we all get those from time to time.
With regard to chemo., everyone is different, different people have problems with different things. From my own experience, I can tell you yes you will feel tired; accept any offers of help you are given. As for the other side effects you may experience some things but not others.
What I would say is, you will get through it. It is daunting, but it is do-able, and each cycle you have is one more over and done with. The hospital will ask you about any side effects you are having, and they will have something to give you that will help.
Its a bit like when you are pregnant and people tell you how awful their birth was . It wouldn't be honest to say its a walk in the park, but neither is it correct to say its terrible.
There are things you can do to manage fatigue etc. which your hospital will help you with, also if you have a big 'C' centre, they will offer complementary therapies like massage etc. which can help. Also again, MacMillan are very good with advice on how to deal with chemo.
It is tough now because you are waiting for it all to start, and it is an unknown, but you will get into a sort of treatment routine. After the first couple of cycles, you get to know how you will feel on particular days, so it is a bit more predictable. The main thing is let others help, don't do anything you don't actually need to, save your energy for the things that are important to you. You will get there, and you can come on here for a moan any time, and always get a sympathetic ear