Then just say "I have a potentially life threatening illness, I need to take care of it". It's honest, no one will push you for details (a withering look will t

Then just say "I have a potentially life threatening illness, I need to take care of it". It's honest, no one will push you for details (a withering look will take care of anyone who does). Take care of yourself. Your life and health is all you have. The business will survive, especially if you aren't contributing much right now. Don't worry about prioritizing your health over a business. It's absolutely the right thing to do.