Being angry is a very natural reaction but it has limited benefits. Without knowing details, it's hard to generalise. Cancer is highly variable and nearly everyone is different, however the following may help:
I too was stage 2. Five years on, I am well, living a normal life and so far there is no evidence of disease.
Veins are unhelpful devils, and I swear they run away. But there are procedures and devices that can be used to stop you feeling like a pin cushion.
Try writing down your questions before you see your oncologist and tell him you want some detailed answers. That's utterly reasonable. He should be able to give you written information on the chemotherapy he is proposing. You will find it daunting but remember lots of people have got through this successfully and not everyone has difficult side effects. The purpose of chemo is to kill off cancer cells. It's hard medicine but it may quite simply return you to health. Which is what we all want.
This is a good place to talk, ask questions, let off steam. You don't have to explain, most of us have been through the feelings you are having somewhere along the line. Perhaps we can help you feel less isolated, more in control and much more hopeful. Best wishes.