Sheridan Smith has revealed that she has been diagnosed with ADHD at the age of 42 and says she is now able to "make sense" of a lot of things in her life.The Mrs Biggs actress, 42, received her diagnosis earlier this year and admitted that it explains why she has a lot of "brain background noise." The mum-of-one, who is set to make her West End return, also began seeing a therapist which is something she wished she'd done sooner. Sheridan described how she was constantly "overanalysing" little things as she opened up about her mental health.