pricing compensation under the data protection act

[postggj]

ill try and be brief as this is not the normal consumer problem

i am employed by royal mail, the ocupational health was disbanded and a company called atos healthcare took over.
they also do the dla claims for the dwp

in march i stated to have problems with my knee. doctor passed me up to consultant as i have ligament damage.
as i was unable to do my duties, atos was called in to do a medical assesment at work. she came, did the doctor thing and left.

three weels later a report was sent to my delievery manager, it stated i was exagerating my condition and recomended i go back to full time duties. no contact was made with my gp or hospital.
this ocupational therapist was not even qualified.
report sent to my manager with out my consent dpa violation, embarrasment etc
i have now had three operations on my knee through this micky mouse diagnosis

for a start, it was no way to conduct an examination by atos.
how can they do this report with out hospital records etc.
this quack could have magnified my condition.

how could royal mail allow me to be exposed to this risk or harm

i am angry and ill be honest,
i want justice, they put my health at risk so this is my question

1/ how do you price compensation under the data protection act for slander and defamation by atos sending a report with out my consent and nothing to back up there asertion

2/ damages for a quack diagnosis by an unqualified rep

by the way

i had my third op monday just gone

thanks