Oh poor you Figgy. It is hard when you meet someone who doesn't know, and you have to tell them, emotions can catch us by surprise sometimes, it will get easier, I promise - but it does take time to get used to and every so often something will trigger off tears quite unexpectedly.
The combo of drugs, steroids and anti sickness do cause constipation, - which is miserable when your not feeling well generally anyway. I would have a chat with the hospital about it, maybe there is something that would work better than movicol for you, - lactulose or something perhaps. It is hard if you have an underlying bowel problem because chemo does effect the bowel so much (or it did me) I hope they can come up with something that will make you more comfortable without making the diverticulitis flare up.
I ate a lot of dried apricots, and tinned prunes, also drank prune juice (mixed with lemonade because its not that pleasant!) hot water with lemon juice in it is supposed to be good (a cup each morning I think) but I haven't tried that one.
I hope you feel better tomorrow - don't worry about moaning that's what the thread is for, - everyone needs to vent, and you wouldn't be normal if you didn't feel a bit fed up sometimes. Also steroids can make you feel pretty down in mood I found, so that might be playing a part too.
take care xx 