hynotherapy - anyone tried this for anxiety attacks?

Our son A is 9 on the spectrum and a happy boy most of the time, but he gets really upset when dogs bark at night time.

As next door have a jack russell that barks loudly whenever someone walks past its house and 2 hounds across an alleyway from us bark and howl at night when they are let out for a minute or two when their owner gets home, you can imagine how difficult it can be for A

He gets really anxious and takes to banging on the nearest window and screaming and refusing to go to sleep again.

tried cotton wool and headphones but seems like he hears the noise all the same

recently been reading how adults with anxiety and addictions like smoking use hynotherapy to overcome their problems

wondered if anyone on this forum with children on the spectrum has tried hynotherapy to deal with anxiety attacks, and if so did they find it helped, made no difference or just made things worse?