i have felt a bit like that recently, after 8 mths mat leave i was getting worse, i could have taken more time off work but dh 'bullied' me into going back to work, saying it was what i needed and i disagreed. i have been back at work now for 3 wks and i feel ten times better. he was right in the end.
it feels good getting out of the house, mixing with other adults, even if its only 2 days a wk. i dont even like my job! but i like the people i work with.
i also hate where i live, so we are moving back home, where we left 12 yrs ago, and we will be close to our family and friends again, i cant wait (moving house is quite extreme though, but its been the underlying reason for my miserable state of mind)
i think hobbies are one thing, but having a job is different in that you have responsibilities and a purpose, is it practical for you to work? i would recommend it!
hope you feel better soon