Coming out of the shadows with questions

Hello! I have been reading for a couple of month now and I just can't find anyone talking about my worrisome symptoms. I am 54 and was diagnosed April 23rd with TNBC, 5 cm, stage 2. Had Pet Scan and Breast MRI, both were clear except for the single mass. The rest I kinda blocked out. I just finished round 4 of chemo, 2 more to go. Taxetere/ Cytoxan every 3 weeks. I had ran into a tall dresser corner one night and after that it felt like I had bruised my peck muscle, I remember thinking,"that's gonna leave a mark." That was in January. It continued to bug me on and off for months, then in April I was putting on a tank top and saw it! I immediately called the Dr. We thought it was a cyst, I almost didn't get the biopsy because of expense. Didn't think I needed it, well, GLAD I DID!  The onc said it was shrinking when he felt it, I asked him to check at 3rd visit because of you guys! To make sure the chemo was working, he said it was. But there is a huge mass of denser tissue there, it swells every night. I'm on my feel all day walking, and every time I get chemo it turns the area red and looks like it is bruising. Onc saw it the last time and commented it looked bruised and I told him nothing had happen to it. And that was that. Have any of you had tissue damage along with you cancer? Could treatment and test cause it? Thank you guys so much for being so open with your trials and tribulations! 

Thank you Amy. I'm going to the Blue Ridge Cancer Center. The onc came highly recommend by one of the best drs we have here in town. I wondered about the treatment as well but have seen some accounts of this beening kinda normal treatment. The onc as well as the nurses have said I was getting the "hard stuff" when I asked about it. I'm normally passive when it comes to drs. Just because I know they are smarter than I.... But I feel I'm learn so much from you guys and am starting to question him. I pionted out to him the lawsuit of taxetere, he pulled it up and said when did that happen, I told him Dec of last year......
Thanks again!

Sometimes I think a padded room sounds good! No, I bumped it months ago, really I kind of feel it was what started the cancer.... I cant find anything on that either, but my grandmother had a cancerous lump the size of a tennis ball I've been told. They say she told them it started after hitting that same place with a broom handle pretty hard.....That was in 1950's I think. The gave her so much radiation that my way older brother said she layed over his lap while he peel the dead back skin off. She lived a good long while after that.

Sylvia