I am sorry that you have been diagnosed with breast cancer. The ladies on this site are very compassionate and will give you their advice as you go through treatment.
The most important thing to remember is that everybod's reaction to treatment is individual - so one person will tell you about bad side effects and another will tell you she breezed through treatment.
So keeping that in mind there are a few things that will help you get through chemo. Keep yourself well hydrated with water and fruits like watermelon that have a high water content. Also tea an soups are good. Also eating many small meals every 2 or 3 hours is better than large meals. Lean protein is good. Stay away from fast, fatty, and processed meats. And lots of fruits and veggies will help with possible bowel problems.
As Michelle said, there are meds for the side effects of chemo, so please let your doctor know if you need them. This is NOT the time to try to be a hero!
Listen to your body and if you are fatigued or tired, then rest - don't push yourself - you must put yourself first! Let friends and family help with the household.
I was able to get through chemo by doing what I have listed.
Remember t o put yourself and your needs first and foremost while you are undergoing treatment.
Please let us know how you are doing with your chemo - and good luck!
Judy