I'm hurting relationships bc of my anxiety

I've been so unwell lately. Just overcome with anxiety. It's been the worst, truth be told. It's never been so bad. I hardly know how to manage it. And my boyfriend has been picking up the slack. I cry to him and question him a lot and he's getting fed up a burnt out (valid). Especially considering I've been questioning his love for me bc Ive been overthinking and just stressing.

I just need advice on how to stop this cycle. Usually I'm anxious about an event rather than just anxious all the time so I am in way over my head.