@MuddyBoots. oh, I never suggested you or anyone should enclose into his mind. I was just relating to your and other posters' experience. I do try to learn to feel my body and associate myself with my full body and my full mind. With little result yet (but not completely without progress).

Feeling emptiness in place of anger is a strong sign that you should vent. Try to carefully think and remember any wrongdoings anyone caused you, you may start now and work backwards. I did found a lot of suppressed anger there. That won't solve all your problems, but it has made me feel a little bit less tired.
If you put your anger into words somewhere like this forum - it will help even more. Also, you may find a lot of resentment instead of anger - it is the other side and is just masking your true emotions.

Also, do it when you have energy. All such exercises require a lot of it.