I may be referred to SMALL clinical trial to remove small breast cancer

My mind is racing ahead and I realise that I am pretty fortunate all things considered however I found out yesterday that I’m likely to have small area of breast cancer. Now awaiting biopsy results. I’ve been told if it is confirmed I may be suitable for a clinical trial to remove under local anaesthetic using vacuum assisted procedure. It would be followed by possibly radiotherapy and hormone treatment. I suffer really bad night sweats post menopause  which I now control with Veoza (non hormone treatment). I’m really scared of the potential side effects of Tamoxifen.  Does anyone have experience