Dang. I'm sorry you have anxiety. I do as well. Not like yours. But I do have anxiety that flares up.
Do you think you're truly suicidal,as in you truly want to end your life? Or is it more of an intrusive thoughts kind of thing,where the thoughts or urges pop into your head only when your anxiety is at its peek?
Have you tried getting help or support for the anxiety? There is an amazing assortment of medications for this exact type of problem out there. Some people truly are helped by them. Anxiety is often treatable. When I have anxiety or extra depression flare ups,I've taken valerian root or kava to help. Those are just natural relaxers kind of like the kind used in tea. Valerian root is over the counter In the USA and can relax you just a bit;basically takes the edge off. Its effects usually last around 2-4 hours for me.
If you haven't already,Please consider getting some kind of help if you have any desire to live. Maybe lean on your parents or friends if you can.? See if they would help you out and support you when you need it the most...
Worse case,Please just be sure you want to truly die,and are thinking clearly in your right mind,if you were to go through with any kind of suicide method.
Additionally,you have us to talk to if you need. Please don't hesitate. That's what this forum is for :)