I have been signed off work by my doctor for a total of 7 weeks now. This makes me feel worse but at the same time your health is more important.

Explain to work why you have been off, and that your doctor has given you more time off and you feel you need to take it...most work places are understanding about this

Personally my expierence isn't so great as my boss ignored me when the doctor signed me off for another month, I am now on the second week from that and I am expecting a dismissal letter through the post as I am unfit for the position. But again, mental health is more important