Yeah Hypnotism isn't really a good option for many reasons
1) On a practical side hypnotism only works very well on around 5-10% of the world's population. Those outside of that population are MUCH tougher to train to be receptive. Given that your asking for full blown amnesia, something tough enough to word yet alone to do, it can take years.
2) Hypnosis is more like the power of belief, yes I know it is an oversimplification, and while indeed you may not consciously be aware of the events that transpired, or worse you are but are unable to express them, and if you can hardly take it your unconscious won't either.
3) Training to be sensative to hypnosis makes you... more sensative to hypnosis and frankly... Hypnosis is rather unsafe and unpredictable. The number of hypnosis guides written in hypnotic language, to hypnotise you, is astounding and frankly almost killed my urge to research it more on its own.
4) Ultimately you are better off comming to terms with the experience on your own since hypnosis can only give you the illusion of wellbeing when used in that manner.
Ultimately it just isn't that helpful for actual psychological issues... at least on its own.
Yes I have practiced Hypnosis on others (since I am nearly essentially incapable of being hypnotised myself... Dang trust issues) so I do know some of this subject.
Ohh and
5) Hypnosis is full of FAKE!!! No I don't mean hypnosis is fake, honestly I can only understand most people's doubts as fear or the belief that the human will is blaw blaw blaw or because Stage hypnosis, but rather that actually looking for helpful hypnosis and hypnosis information can be nearly impossible.
As a suggestion...
Do NOT, and PLEASE do not look elsewhere, try hypnosis to do this.
No honestly I should put it in all Caps
DO NOT USE HYPNOSIS IN PLACE OF ACTUAL PSYCHOLOGICAL AID
If your just interested in some cool hypnosis I guess I can understand though...