It is unlikely that you have developed a disorder as a result of your divorce. However, divorces can be stressful and emotions often run high for some time; it is more likely that these factors are contributing to your concentration levels.
It sounds as though are distressed by your difficulty to concentrate of late (as mos people would be), and I wonder if you would consider speaking to a counsellor? Your GP should be able to refer you, alternatively you can consult www.medpages.co.za for someone in your area.
In the meantime, ensure you are eating and seeping well and perhaps look into some relaxation techniques that work for you.
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