What follows is not scientific, backed up by experiment or entirely factual.
I have had a mild and so far short experience of another world, the place we call pain. That particular sensation that can stop us short, make us quiet and loose us sleep. I have always associated pain with animals, I have no idea why, but maybe the hours of TV I watched as a child hold the answer. I remember a particular public information film a bout rabies which featured stock film from a foreign country of a dog frothing and writhing in pain in a cage. Just maybe this was my time of awareness of the possibility of pain within me and felt universally by animals and humans alike.
I don't claim any kind of early analysis for it took me another 10 years at least to make the connection between my diet and the suffering of animals. But that information film sticks in my mind and that is where I will hang the idea of pain.
I have been managing the pain with Paracetamol, Ibuprofen and at the extremes codeine, all these substances have their effects on us. The codeine particularly speeded and reinforced my emotional responses to any triggers. When I first got home from hospital I cried at the sight of close friends, any moving Facebook post and any show of love towards me.
As someone who felt that in the past I had a lack of emotional response to life this was both a contrast and a welcome chance to let it all out. Here I think also I feel that this is a more animal way to behave, less guarded than our human restraint and decorum.
Maybe also I have learnt to listen better to others, to stay quiet and to really take in not just what a person is saying, but how they are expressing themselves. Why an experience of pain should do this I do not know, but as I said at the start this is an emotional gut reaction to how I am feeling.