Comes with the job

When you are doing any job then the stress and strains of both work and of life outside work can take their toll at times. I know many people who at some point in their career have needed leave related to this, It is nothing to be ashamed of. 

My thoughts on the matter are two fold:

1/ Looking after yourself is always more important than what is happening at work. If you struggle on working chances are you will just feel worse. Better to get sorted and come back to work fresh.

2/ Dont bottle things up let others know what is going on and that way issues can be addressed sooner.