What should I do ?

A few weeks ago I held a gun to my head and was so tempted to pulling the trigger. I have major depressive disorder, PTSD & anxiety. Now I’m currently in a partial hospitalization program and will be there until March 5th & I haven’t been in school Since January 17th, there is only about 5 of my closet friends that kno where I am. Other people that I go to school with keeps texting asking if I’ve dropped out of school 😂. I told my mom and she said tell them the truth but I feel like they are going to think I’m fucking crazy, she said my real friends wouldn’t judge me at all. If your friend told y’all that what would y’all think ? And also, what should I say ? The truth or that I’ve been “really sick.”