CP is Chronic Prostatitis. So, you said you understand that caffeine is
supposed to irritate a prostate. If it irritates a prostate on a person
suffering CP, then of course it will affect your prostatitis.

Doctor told me not to have coffee or tea (tea being worse than coffee as
there is more caffeine in it than in coffee) etc, eat the right foods (low
carbo and higher protein supposing the kidneys can take it - which they can
in my case). Higher carbo put more fat on the body (mid section) and thus
more pressure on the prostate even just from the effect of more fat pushing
against it. He told me to pee often though that isnt an option for me, drink
a lot of water, take doxy etc. In my job, driving from spot to spot to put
out computer "fires" (so to speak), drinking a lot of anything isnt an
option and of course I dont take any antibiotics after learning for myself
that constant use of them lessens the impact on your CP pain. He said not to
take anti inflammatory pain killers if possible (realising sometimes you
dont have a choice) as constant use of them is unsafe but before it gets
that far, it irritates the gut which in turn irritates the prostate and thus
CP. Lots of common sense stuff but some of it I cannot do in my job.

One of the things he said was to pee often NOW to avoid it being a problem
as soon later in life. I cant do THAT in my job, either - I can sometimes
start work at 9AM and run from job to job and get a chance to pee at 4PM. I
find that has made my sleep time a lot more bearable as I guess my bladder
has expanded somewhat or maybe isnt as hard walled and somehow helps with
urinary retention even though the pain in the prostate seems worse - which
may just be coincidental.

Hope that helps.