Professional counseling

I have to make major decisions. I ask for advice from someone with several years of experience and professional training. This is my situation: Preparing her for the news. I don't want my mom (she lives abroad) to be shocked when she hears about my death (svicid...). The rest of my family can handle it better. For example I made up a story and told her I had a strong headache that felt like a tumor in my brain. The goal is to make her understand that my death is a possibility within a month. I hope you can give me other ideas for my final communication with her? I'm 30 years old. How long will you provide support? 30 minutes? 1 week? Please let me know. THANKS FOR UNDERSTANDING.