Hey Alex just giving my little 2 paisa from a very different angle.
You mentioned it came back with a vengeance and you feel the lump.
You either under express or over express. In my view, you under express. You have a lot that you have stored deep within and you are somewhere manipulating your own emotions, may be that's not the exact word, but I hope you understand what I am trying to say. Your throat chakra is out of balance and that's where you feel the lump. It's ok to release and let it go. Do not feel scared of expressing, crying out and allowing your true feelings to come out. It would be safe to do that.
I may be wrong with my whole interpretation, but the root cause of every physical problem lies deep within us. It's the energy block, if you clear that, the rest will just flow. Even chanting may not help you, cause till the time you do not release, you will just be burying it further within you and that will only build up.