Why don't cancer doctors tell you all the side effects before chemo starts?

My rant / Bitching for this month. Back on chemotherapy and feeling like crap not from the cancer but the treatment. My gripe with oncology is every day is like a jack in the box, you don’t know what is jumping out at you until it does and nothing close to being fun. So the first time I had chemotherapy I also was being microwaved radiation never told me all the crap I could expect until I was done by then I had already been kicked in the jewels by everything that was a possible side effect and never told about all the crap was or could be coming for a year and it was almost 2 years of changes but not told until it was happening. Oncology is the same I asked what to expect and was told I may loose hair, feel weak, have nausea, first run of chemo felt like shit and at the same time was so out of it. I had no idea where I was who I was I’d couldn’t give a crap. If not for my wife I would be dead as I was ready to drive 3 hrs a day to get treatment and there was no way I should be driving at all. Now the new round of chemo all kinds of stuff and if I question what I should do I’m told probability is caused by chemo. So my question is if they know all this stuff why is it not just printed in a big ass book titled CANCER why it sucks and what to expect. It’s not like I / we didn’t ask what to expect. Any patient should be told before it starts.