overdoing things? and lots of pain ... are they connected

The last few weeks I have been trying do all the things I like to do while I have been feeling a bit better.  I have completed an assignment for uni, I have been out with my beautiful daughter to a vintage festival and a bit of retail therapy, and dinner with all the family to Nandos.  Had a lovely day out with my hubby to the seaside, for his birthday, which entailed rather a lot of walking and lunch with a very dear friend.  I have started to take the dog a bit further for her walks now the weather is a bit better.  I have noticed that I am falling asleep more on the sofa in the afternoon though.  I had hoped to try to go back to work tomorrow, but instead I am going to be ringing the doctor to put it back again.  I have a trip to London booked in three weeks, and am really worried now about how I will cope, when I booked it I wasn't at all bothered.  Hubby and I are going in a group of about 12 people and I am worried that I will slow them all down.  Last night I was kept awake by pain in my left side, every time I take a deep breath it feels like I am being stabbed.  I am used to the pain in my right around my liver, and that is more or less controlled now, but this new pain and the pain and bloating around my stomach is really starting to get me down.  Hubby asked where we were going to take the mg today with the roof down to make the most of the sun, but I am not even sure I can even get in and out of her today.  Well consultant on Tuesday, and I am guessing it will be another treatment change, this frightens me, how many are left, how much stronger can the painkillers get before we go to morphine, morphine spells end of life care to me.  I am not ready for that yet, though I am starting to understand people who chose to end their fight because they can't cope with the pain, I am not there yet, and don't want to be for a long while yet, but I am at least beginning to understand, and I didn't ever think I would.