Aye, long post ahead. Again.
Reading at own risk
You must’ve hidden a citing book somewhere. 
Or google does.
Anyway, I did not mean “new” by saying “modern” - maybe that term wasn’t quite the best. Which is modern not necessarily is ‘new’. The used term of ‘modern’ merely referred to ‘our times’, or ‘nowadays’, if you like. For example:
There had been allergic reaction throughout the history, only because they wre diagnozed or called differently, they were just that: “stuff your body did not like”.
So, there is no quite new thing under the sun - unless you define ‘new’ with “had never been there in this form/function/manner of use/material combination/etc.”. Although they are yet merely aspects of their former form/funtion/… they are quite sth. new if combined in a specific way.
Following this “obsessive-compulsive” is a ‘new’ or ‘modern’ term for a ‘new’ or ‘modern’ illness: Combining these and/or those symptoms to this specific disorder/malfunction/illness.
(Darnit, sometimes I really like, when my ability to look at topics from an almost neutral and/or non-sensitive point of view…Although it comes down to definitions then and again…) 
What actually is new to the topic of disorders, is the fact they are diagnozed many times more than even some years or decades ago. When it comes down to that, everything certain doctors do, is matching symptoms to a set of illnesses. - Well, good doctors know that being a doc means much more to it, not to mention a pretty damn good intuition and working at(/on?/with?) the patient - pressing here, pushing gently there, etc. I (within my 10 to 15-ish years of “self-concious” living) already had some physicians who just listened to what I told them, looking into their computer giving the exact diagnosis I intended, despite the fact my health was totally fine. (And no, I’m not just 16 years of age. :P) Well, back to certain illness.
So, in matching symptoms, a possible therapy is worked out and after that it’s a matter of time if the therapy does work out for the patient.
(Btw, in English langauge I think it almost hilariuosly funny that ‘patient’ (noun) and ‘patience’ (noun; ‘patient’ adj.) have the same word stem. I happen to like such linguistic ‘humour’…)
What I think in case of disorders, is (what I mentioned before), that I don’t define something a disorder, only because someone told you so. Even most ‘professionals’ tell you what the ‘modern’ society thinks is ‘disordered’.
Different to the point when one self thinks that a certain behaviour is quite ‘unsual’ and it is repeated by oneself against the individual’s will (-now we’re at the OCDs again-), then (if being that individual) I would call that obsessive and compulsive disorder.
Again I might add, I’ll see my arguments valid up to certain extend. Also I understand 'em merely as ‘point of view’ and not common sense, or any official statement of whatsoever. 
It is so frustrating to feel the urge to NOT MISS THE DAMNED THING! At times I had to repeat to myself “IT’S JUST A GAME”, and I managed to get thru, but not the usual case… At any rate, the site at that link MAY BE OF SOME USE INDEED (especially to people who suffer from OCD but are new to info about it, or who feel too odd about it; it left me a bit more at peace, at least)… At any rate, I’ve found my faith in JESUS CHRIST to be more than enough in times of need, and the compulsions are no exception… !! Blessings to all who read this, even tho the OP is old! 
