The Breast Cancer Physio. ( Qld) has a helpful playlist of several videos on her you tube channel https://youtube.com/playlist?list=PLjQRo6uAU0yVeIGbeS8-XGH-Sn6d12ydu&si=LXDSlO76UKP1RK2f
Aslo use the search tool ( only on desktop you tube viewer) for cording within the you tube channels of :-
OncoPelvic PT, https://www.youtube.com/@oncopelvicpt
Cancer Rehab PT, https://www.youtube.com/@CancerRehabPT
Breast Cancer Rehab https://www.youtube.com/@breast-cancer-rehab
It is also called axillary web syndrome.
Yes it is important to do the massage/get the special firm massage on the cord , i have heard it can really hurt, but the sooner you get on top of it the better, it can take a while to fully resolve, some people get it and others don't, it can also increase your risk for lymphodema, so i hope your rehab therapist is also well versed and watching for that and helping you learn as you go.
Great your a gym junkie, hope you know you now need a Longer warm up and longer cool down, slow incriments in your weight lifting, no sudden intense sessions or you may get a sudden increase in fluid more than your body can process and get a fat arm ,even if wearing a proflyatic sleeve . If you have a break from gym for a holiday , then start back slower and lower and build up the increase agian. Exercise physiologists who do cancer rehab and lymphodema are great at helping fine tune and refine your workouts with you to minimise risk.
eg Peak Health Gymea. Sydney.
Hopefully if your aussie your in a pre lymphoedema screening program too.