I have had two episodes of depression. The first arose out of chronic anxiety that wore me down. I did not understand I was depressed until I started having panic attacks, saw Occ Health doctor and she told me I was depressed. Looking back , it was obvious, but i think the spiralling thoughts of self-blame mean you don't realise it's something more than being a 'crap person'.
So for me, symptoms were: anxiety, apathy - went to work but then could not do things like the washing up, zero libido, insomnia (especially difficulty getting to sleep) lack of appetite, suicidal thoughts, not wanting to socialise and believing that no-one would want to socialise with me, feeling of loss of hope. I started off emotional and then became 'flat' and unemotional.
My internal thoughts were; you can't cope, no-one really likes you, you are pathetic.
I resigned from my job, did not work for 6 months, got fit and have been recovering ever since. I would never ever now put myself in the position of being overwhelmed by job responsibility and my job reflects this.
Had other milder episodes after both DCs and I think I will always be prone to it. My DH is incredibly supportive of me