Auxiliary lymph node removal

I had breast cancer 12 years ago and underwent a lumpectomy and radiotherapy. I was diagnosed again with breast cancer in November last year, this time being stage 2. I had a mastectomy before Xmas and began Chemo in February. 
I had 3 x EC Chemo after which I suffered 2 weeks of nausea each time. I then began Docetaxel Chemo. 

After my 4th treatment I developed a DVT in my left leg and subsequent bilateral Pulmonary Embolisms. My heart rhythm became distorted and beat at an extreme rate. I was admitted urgently to hospital having become extremely breathless and placed on Oxygen.

Discharged 8 days later. I agreed to a 5th treatment at a reduced rate but refused the 6th and final treatment due to the risks. 
I now await an auxiliary lymph node removal operation on 17th July. This was deferred from 3rd July to a later date due to the risks of further clots by the Anaesthetist. I am to have compression boots applied before the operation to reduce the risk. 

I am quite scared about this operation having been through so much. I am extremely thankful to my family and friends for their ongoing support but would struggle to discuss my fears for surgery with them.