Lymphatic massage - how do you know if you need it? when do you start?

I went to Physio as my movement was limited to where I felt it should be at.  She recommended that I see the Remedial Therapist within the same practice, Jo, who does lymphatic drainage massage.  No I don't have lymphedema but I was having discomfort and a little bit of fluid build up.  Jo has made such a difference and I go and visit every now and then for maintenance, as I call it.  My main discomfort is in the sternum and as she explains it the lymphatic system has been interrupted and it is busy looking for new pathways.