I feel like I'm going to die tonight

I don't know why, but everything I'm doing today feels like it's the last time I'll ever do them. It's kind of scaring me. I've had issues with depressing/suicidal thoughts but I've never straight up felt like I was going to die. When I was suicidal, I wanted to die, I didn't care. Now since I actually feel like I'm going to die I'm kind of panicking. Like, it's just a feeling, like I'm not going to wake up if I go to sleep. Like I've considered texting my family members saying goodbye and I love them. Has anyone else ever felt something like this? I don't know what to do... Any advice? Please? It's appreciated, thanks for reading.