I've been there and it's awful. My tips are: prioritise sleep. Exercise each day, even a walk. Morning ideally. Eat sensibly, look to keep your blood sugars level. Drink loads of water and minimal caffeine. Don't eat sugary/white carb things too much. Take a good B vitamin complex and magnesium.
None of the above are magic wands, but when I prioritise these things, my anxiety 'baseline' is much lower.
Then the bigger stuff: see your GP, or another GP. explain it is debilitating. Take the drugs. Try different ones if you don't see any improvement in 6 weeks. Push for therapy and go private if you're able.
Try not to have too much 'empty time' to let your mind wander. Eg when cleaning, listen to a really gripping podcast.
Try to force rational thought. Eg when you think 'Im dying' speak to yourself sternly, eg 'well there is a chance any of us could be dying right this moment, but realistically, what are the chances? I didn't die yesterday, or the day before that, or the day before that. Statistically, I'm likely to live well into my 80s. Statistically, young women don't often just drop dead.' It sounds silly but the more you practise this - out loud ideally - the stronger you feel challenging these irrational thoughts.
Good luck to you OP. I promise it can and will get better x