No, you are not putting your job 'at risk'
If the only time you have had off sick is the 3 months last year then you are in no way putting your job at risk for taking a week off now
Quite apart from that, your employer cannot just unilaterally take away your job when you are off ill, there are procedures to follow but you are not near them yet
Keep your employer informed at all times what is happening and a week off now could mean you won't need a month of in a couple of weeks
Your employer can see you are making strides to 'get over' this, you have everything in your favour
You'll find the answers to many questions here:
http://www.direct.gov.uk/en/index.htm
You can call ACAS for euclidean as well:
http://www.acas.org.u...x.aspx?articleid=1410
Good luck