Mould from leaked roof coming into bedroom below advice

Henrta

Roof has been sealed up now, but the undetected damage ended up causing mould most noticeably here behind fitted wardrobes and starting to give me allergic reactions with conjunctivitis and chest symptoms.
How do I approach this? Does this need to be removed from above via the loft with everything else checked? Can I cillit bang it from this side with a long stretch or a roller and see if there's any permanent damage afterward? Trying to avoid the answer being I have to remove the whole fitted wardrobe.
Advice welcome and thanks in advance.

Grenage

That wardrobe will need to come out, then it can be properly looked at and tackled 

ThisIsWeird

Hi Henrta.
The presence of this mould is seemingly causing you some very unpleasant medical issues. 
Zooming in on the (grainy) pics suggests that the wall's plaster is deeply damaged and crumbling. That indicates a fairly significant amount of water over a prolonged time.
Do you think the damage is limited to what you can see above the wardrobe? Or is it likely it goes pretty much all the way down to the floor behind that unit? Yes, that's what I think too.
The unit needs to come out.
Almost certainly this will be a much simpler task than you fear - a handyperson will likely have it disassembled in an hour or so.
With the wall cleaned, plastered and painted, and probably a new wardrobe back panel, you'll be back to as good as new.
Could this have been an insurance job?

Henrta

Insurance I'm having looked into. When I looked over the side the damage seemed to be limited to what you see (not going any further down), but I am concerned about the rot and mould in the loft and will have to check there if I can't get someone to do it and that's a bit of a riskier not ventured in years task.

ThisIsWeird

Almost always, once the source of wet has been addressed, the affected areas dry up and 'die'. End of problem.
That will likely also apply to your wall and wardrobe - any existing mould is likely to stop. But, the wall is a bit of a mess, and really is worth sorting.