Stress results from situations that arise where we do not feel that we

have the resources to meet the demands of the situation. This can make us feel like we are unable to achieve what is expected of us, either from ourselves and/or others. This can lead us to feel constantly anxious, negatively impacting upon our ability to focus, plan and carry out tasks in the most efficient way. 

Common signs of stress include:

Irritability
Loss of concentration

Procrastination

Headaches
Indigestion/IBS
Tiredness and difficulties with changes in sleep patterns
Drinking, smoking, nail biting etc