From past personal experience my advice is that you MUST insist on getting a definite diagnosis for whatever it is that's not quite right in your arm. I myself started with a tight feeling soon after a mastectomy. When I asked Staff about it I was told that it was something called 'Cording' and it was just an after effect of surgery. Following on from that my arm still had this tight feeling (like something tugging right down my arm...... more noticeable if I needed to stretch to reach for something - my hand/wrist area couldn't fully function - like string on a puppet being pulled tightly and not allowing my arm to have the full range. It really hurt too!! Months of discomfort and pain passed before FINALLY I was diagnosed with arm Lymphoedema. This is why I say you MUST push for answers. I wasn't forceful enough and that cost me extra wasted time before being diagnosed. My arm was so swollen by the time I WAS diagnosed that its taken a LOT of work on my part and also a lot for my lymphoedema nurse-specialist before we could get it under control. Even now my arm is twice the size of my other arm and there are times when it really gets me down. So PLEASE Sika, push for a proper diagnosis with your arm and push NOW. I wouldn't want anyone to go through what I've been through.
I have 'very mild lymphoedema' and was seen really quickly by my BCN after I said I had aches, tightness and 'it seems a little bit bigger than the other one'. The difference in size was 1-2cm, depending where she measured, so she tried first with exercises, but that made no noticeable difference, so now I have the 'lightest' compression level sleeve and the difference in how it feels is enormous! The lady who fitted my sleeve could see the swelling (she knew exactly what she was looking for) and said it was better to catch it early than to wait and end up with a really swollen arm. My BCN did say that loads of ladies wouldn't know they had this level of lymphoedema but because I reported discomfort it was better to act. The specialist lymphoedema provision where I live has a horrendous waiting list so they only tend to refer you if it's really bad, but the sleeve fitters are very knowledgeable.
I would try to get it checked - if it isn't the dreaded 'Lynn Foe Dema" well and good, but something isn't right and you need to get it fixed.
Would def phone again and ask to be seen by Lymph Clinic asap, when I was worried I phoned my BCN and was seen in less than a fortnight, so do phone today, it's worrying you and you are sore and uncomfortable, don't wait. I didn't realise my arm was swollen until measurements were taken so don't leave it to chance.
Hope all goes well xx