Sorry you are here to join us.
It is a lot to take in.
I have been very lucky and not had many side effects. So I hope that your theory is very wrong. My story is here if you click on my name or icon.
Your hair will most likely fall in the next week or two (unless you used the cold cap.)
Side effects vary so much between all of us here.
I hope that you will report your nausea, in case you can have more medication or a different one if it is possible.
Keeping a good fluid intake and reasonable nutrition helps to avoid other issues.
I can't explain your pain etc.
Don't be afraid to ask your Oncologist, or Breast Care nurse if you have one. Ask anything. Make a list of questions.
I also kept a diary. And asked for copies of my reports/pathology. Take someone with you if possible to the Dr.
All the best, there is a way through, and you will get through it.