Luckyrose62....
You have been a good daughter and your mother is lucky to have you. The issue with your daughter seems to have put you over the edge with everything else that has been thrown on your plate. Unfortunately, you don't have enough information on that front, so why dwell on worst case scenarios?
Would it help if I told you that most breast lumps turn out NOT to be cancerous? If perchance however, the lump is more serious, it still won't be the grim illness that cancer was decades ago. Today, people are LIVING with cancer; not dying from it. There are revolutionary new treatments for breast cancer and more importantly, they are also less invasive.
With regard to aging parents and ill health in general, we all have our crosses to bear, some heavier than others and especially as we get older. They can be so overwhelming at times, that the positive things in our lives become insignificant by comparison.
So, take a deep breath right now and make a mental list of all the things in your life that are good because they are important too....and no matter what happens, visualize the day that your daughter regains her good health.
Sending you healing thoughts, prayers and a virtual hug.