Anxiety/depression advice

I struggle with severe anxiety. I often sit while gears and worries race through my brain about shit that will never happen. I don’t have any nails left bc I bite them so often. I cry every spare minute I have. In the shower, studying and I can’t sleep bc I cry for about 3 hours before I should sleep, and my brain just won’t rest long enough for me to sleep. I’m sleep deprived, fed up, irritable and borderline suicidal. Pls could someone help or give me advice bc this is the last time I want to deal with this shit. It’s taking over my life.