Hi Norma
A kindred spirit in pain here. I have a chronic pancreatitis that causes me chronic pain and have an implanted medical pump that delivers medication directly to me via my spinal fluid 24/7 at a constant rate. I have to go in every 12 weeks for a "top up" however the result is my pain has been under control ever since it was implanted 5 years ago. However the preceding 12 years before this were very unpleasant.
Being in chronic pain is very challenging and I actually understand what you are talking about, there was a period of time when I did not want to talk to people because all they saw was a "person in pain" and not me. I remember having to ask my family if we could actually talk about something else when the spoke to me...I do not try and hide when I have pain anymore...If I have it, I deal with it. My family understand that I can become unwell very quickly and without warning...but it took time for them to understand this. The hardest thing to get them to realise is that even if I am having a bad day part of my strategy to cope is to deliberately not focus on it and I may well be able to continue what I am doing if given a few minutes to collect myself. They now allow me that time and we then continue without a huge disruption.
It took them a long time to understand that I will not vocalise how I am feeling unless there is a need for it and that they cannot judge my level of pain without asking me. I may appear to have pain but that does not mean I want to cease ( or get in a discussion about it, no matter how well intentioned) what I am doing and quite often I will get ambushed with a hug when I am having a bad day.

All this took time and I had to set boundaries for us both.
Feeling dysphoric while in physical pain compounds the pain situation for me. I would get stress induced acute pain on a regular basis and this was the "suck the wind out of your lungs, drop you to the floor" kind....Since I began to transition those attacks have faded to a rarity. Touch wood....I haven't experienced one since starting HRT.
Having your head in the right space to deal with your chronic pain is so important. I am far better equipped to deal with it now than I ever have been. My illness comes in and kicks my butt just to remind me "its in charge" but on the whole getting my Dysphoria under control has help a huge amount.
Then there are some days that it just sucks and you are sick of it...