OP, if you already have extreme anxiety about labour, hypnobirthing is unlikely to be successful for you.
This is both correct and incorrect.
It is correct in that beyond a certain level of anxiety, you are unlikely to be able to sufficiently engage with the process to benefit significantly, if you are only teaching yourself from a book, or downloads.
It is incorrect, however, in that one to one sessions with a qualified hypnotherapist/psychotherapist (not somebody who is only qualified in hypnobirthing but has no other therapy qualifications), are likely to be very effective at resolving your anxiety, and putting you in a position where you can effectively utilise the techniques in labour.
Hypnobirthing cannot fix problems that are purely mechanical, but it can significantly reduce pain and anxiety (which are, of course, linked), the need for pain relief, and also the need for intervention. It also helps women accept and go flexibly with the flow if the unexpected arises (which is not to be sniffed at).
That said, if you would nevertheless prefer to go the epidural or ELCS route, then you should have the choice to opt for that, and the NICE guidelines allow for that. The risks for ELCS vs VB are pretty similar in magnitude, though different.