What to do?

Am I meant to not work? I don't mean am I meant to be a lazy arse but really, why does a bog standard job have such a bad impact on me?
To give a bit of background to this sudden "wargh". Ever since we left the UK, the good doctor has been commenting on how much I'm back to how I was before ... well, before the IBS, the phobias and the OCD. How I'm more relaxed. More fun. Have more sense of humour. And indeed how very much healthier I am. I have been amazed by the behaviour of my bowel and the almost complete lack of IBS despite house moving stresses and a new country and all the rest of it. And I was winning huge ground on the OCD in particular. And then I went back to work. And I feel dreadful. My stomach is tight and ughy, my digestive system doesn't know whether it is coming or going (one of my major problems with IBS for me is that I feel dreadful, dreadful, dreadful, starving with no warning to get in there before I'm ridiculously overhungry) and I'm not doing sooooo well on the OCD. (Apologies that I am not explaining either the OCD or the phobia if you don't already know about them - I'm just not really in the zone for lengthy explanations at the moment, maybe later.) So anyway, back to the point in hand. I feel naff! More than naff really... I'm completely exhausted at the end of a days work. And the work isn't that hard. And I'm not getting wound up by it. And I am leaving it behind when I leave. But still, I am shattered with no proper appetite and a sudden lack of enjoyment of life that comes with the return of the IBS. Am I being too hard on myself? Is it just that actually I've not gone to work for about seven weeks and suddenly I expect myself to be able to do full days of work no problem? Or what? Hum. No fun!
I'm not helped by the fact that I keep getting contradictory advise from someone close to me (not the doctor). One minute it is "don't you think you need some full time work?" followed moments later by "at the first sign of IBS, quit!" So I do not know what to do. Which is fine really cos I never do but thought I would get it out of my system here. :) Thank you!