So what would actually happen on an assertiveness training course? What will you learn? It will help you understand how to achieve your goals and stand up for your rights without neglecting the rights of others. Assertiveness is not about getting what you want - it is about creating win-win outcomes.
You will probably learn about the differences between passive, aggressive and assertive behaviour. You may do some role play exercises to demonstrate the differences. And you will certainly learn some practical tools and techniques to help you become more assertive in your day-to-day life.
Stress is a medical condition and it can have a serious effect on your health. If you think you are suffering from stress it is crucial that you consult a medical professional.