I was diagnosed with breast cancer in March and completed four cycles of EC chemotherapy. The plan was to followed with four cycles of Herceptin,  Pertuzumab and Docetaxel. However the last cycle of Docetaxel was cancelled due to fatigue and shortness of breath. 

I've been told that this could just be due to the chemotherapy,  a low haemoglobin level or heart damage. I have an appointment next week for an echocardiogram prior to surgery of a wide local excision. 

The chemotherapy had been brutal and I've also got thrombophlebitis in my left arm which I can't use fully.  Now I'm possibly looking at heart damage too. 

Has anybody else had any heart issues while on Herceptin?  I'm supposed to be on Herceptin injections for a year. 

Will the thrombophlebitis get better? The Doctors don't seem to know and just say "maybe."