Hello everyone, and welcome @Sirprised
I had BC, and full node clearance in Sept 2022, and like you have been worrying about lymphoedema ever since. I started noticing some swelling in my arm in August, and finally had my appointment with the lymphoedema clinic last week. Sadly, I do definitely have lymphoedema though it is early stage. The consultant I saw was extremely helpful, and probably the nicest, most considerate doctor I've seen all the way through my treatment. She said that while it's still not fully understood, the latest research suggests that you are more likely to develop it if you had bad cording - which I did - and that they are linked in some way as cording seems to be some sort of fibrosis of the lymphatics. That makes me feel a bit better in a way, in that there's probably nothing I could have done to avoid it. She encouraged me to do whatever exercise I wanted to do, bar suddenly starting lifting very heavy weights. (I mentioned that running seemed to make it worse and she said that will just be temporary because of the increased blood flow, but that the benefits outweigh the harms, and to just try to find a balance.)
I now have to wear a very ugly compression sleeve and feel a bit shit about that, as it's just another constant reminder that I will never be back to 'normal'. On the plus side, my arm is a lot less painful and a lot of the pain I thought was nerve pain has lessened or gone. The consultant did say that they used to put off giving people compression treatment for as long as possible, but now think that if they use it early it can help reverse some early stage swelling, and that I might be able to move to only wearing it some of the time if it improves. (I'm also exploring private LVA surgery, but it is terribly expensive, and the longevity of the benefits aren't known.)
Have been so busy with work and Christmas prep these last couple of weeks that I've done almost no exercise or active recovery, but I will aim to fit in some before Christmas and restart in earnest on 27th.