Agree 100% with the way it results in real actual illness when you hang on to stuff.
Hers manifested in quite aggressive breast cancer, but it was the kick she needed to let go of a few things, by the time her treatment started she was in a much better headspace, looked at her health from a wholistic view, as in her whole body/mind wellbeing before treatment started and the way she reacted to the treatment just amazed us, didn't loose her hair until quite late in her treatment, it started growing back within a month, she has hair now and she only finished all her treatement just before Christmas.

For me, I was holding onto lack of forgiveness, couldn't forgive certain people in my life, couldn't move past their actions, but I sat down and really thought about things, realised that I needed to release their hold on my life, so I forgave them, in some cases I have forgiven the action, but that was at the point that they were banished from my life, I didn't want to hold on to anything to do with them and I feel fantastic for it now.