Is this normal?

Hi all, I don’t post much, but have been part of the group for a while.  I’ve been able to find most of the answers to my questions in other people’s threads, but not this one.

I had a lumpectomy in October 2018 to remove 4 tumours in left breast, the largest was 3.5cm, the other 3 were in a group and all about 1cm.  They also removed a few lymph nodes that were clear.  A second surgery 2 weeks later to get clear margins, then 5 weeks of radiation, which finished a few days before Christmas.

My concern is that my breast is still pretty swollen and a bit sore. (I am having physio occasionally to help relieve a golf ball sized lump of scar tissue and fluid) plus I now have thickening on the underside of my breast, well away from either surgical site and my breast is hotter than the other again.  

The thickening of the underside of my breast is new, only noticed it a couple of weeks ago.  After radiation my breast was hotter than the other for some time, but gradually got better.  Is it normal for the heat thing to re-occur 5 months after radiation has finished? 

I had my first 6 monthly check up in March and got the all clear.  Except for that golf ball sized lump the doctor was happy, so I’m not worried that cancer has returned, but I can’t understand these new changes.

Any advice would be much appreciated, I’m freaking out a bit.

thanks!