persecution complex 
(also persecution mania)
noun
An irrational and obsessive feeling or fear that one is the object of collective hostility or ill-treatment on the part of others.Psychiatrists who examined him found he had a severe mental disorder and was suffering from delusions and a persecution complex....
- Is midsummer madness giving you a wee persecution complex?
- I swear, the persecution complex is so reflexive for these people that they can find a cloud in every silver lining.