Yep. Very often after I 'go' there is a feeling behind my coccyx that I need to go again

OK if I'm home but not when out and about, i.e. shopping

What's your diet been like in recent days? MayB drinking a probiotic or eating/drinking kifer will ease the slow transit. How is the wind?
I have suffered slow transit for many years, very occasionally I feel like I have emptied completely. I know where every loo is in every town that we visit is, on an in case basis.
What's the cause of the diverticulitis? Tenesmus is when we feel the need to 'go', can't, get up, walk around then go back with some success. Very annoying!
What R your periods up 2?