Anxiety can feel so terrible can't it. It's good that you've found your way to Beyond Blue (BB) forums. Welcome! You'll find the people here are friendly, caring, supportive and respect individual's privacy.
We're not counsellors or therapist, all we do is share our experiences in the hope it may help people, like yourself.
I do have anxiety myself. It comes and goes as I'm triggered by one thing or another. I actually lived with it for 40 odd years before being diagnosed with it. Over the years I've learnt many different strategies to help manage my symptoms and triggers.
You specifically ask about 'hypnotherapy'. Yes, I have an some hypnotherapy in the initial stages of recalling my childhood trauma. It was used in conjunction with relaxation to help me reduce my heighten awareness and hypervigilance that I was experiencing. But the hypnotherapy was not done in isolation, I was also going to anxiety reduction classes as well. The classes looked at the bodily responses, the triggers, the reasons behind the triggers. It was very comprehensive. The hypnotherapy came afterwards to help me relax and move into a more stable frame of mind. I found it extremely helpful and in many ways I don't think I would have come through what I needed to look at without having a few of these sessions first.
There are a range of different methods that psychologists use to assist people with anxiety, hypnotherapy is just one, but it is not used on its own as I've indicated above. Some times it is finding the right psychologist that suits your needs. I've stopped seeing ones that weren't helping, but it hasn't stopped me from finding another one. My GP has been particularly caring to make sure I am receiving the best treatment that I need by finding more appropriate psych.
Hope this helps. Let us know how you go.