United Kingdom, Feb. 13 -- Tuppence Middleton has been battling "devious, nimble little beasts" in her brain for three decades.

The 'Downton Abbey' star has been dealing with obsessive compulsive disorder (OCD), which has forced her to be late for work and make out there are transport issues as she needs to take daily photographs of her electrical appliances to ease her anxiety and open and close her door eight times before leaving her house.

In an extract from her upcoming book 'Scorpions' obtained by MailOnline, she wrote: "My mind is full of scorpions. Devious, nimble little beasts that have occupied my head for the best part of 30 years ...

"It is leaving the house that presents me with the biggest challenge.

"In the midst of my o...