My PTSD is from childhood and it created a repressed memory. Its actually a form of childhood PTSD, to dissociate and never recollect that it happened. Mine first started appearing in strange ways. I wasn't going to therapy, I wasn't more stressed out than normal. In fact, I was pretty happy. I was in remission and had finally gotten a job and had moved in with my fiance. I take the city bus everywhere because I've never gotten around to getting a licence and I can't afford a car. Well, I was sitting at a bus stop (that I didn't normally wait at) and this guy starts coming onto me. His eyes weren't right. They weren't normal, kind of crazed. It sent a jolt through me. While I was on the bus I began having a weird feeling in my gut. I couldn't shake this weird feeling and later that night, I had my first flashback. I left it alone for a few solid months. Then another one happened. The second one rocked me bad and I couldn't make myself shake it. Seven months now and they've only gotten more frequent, more intense (vivid) and I find myself depersonalizing and dissociating from everything in my surroundings.
So, from experience I can say that childhood PTSD can very effectively cause dissociation and repression. There is a huge period of my childhood that I don't remember following the event. Among other things, I don't remember periods of my childhood when my parents were drinking heavier than whales in water. The most I remember are flashes of abuse and then its gone. I don't poke at those too much because I already remember enough that I don't like and I can't handle any more right now. Will you have repressed memories, I don't know and I hope not. I think you should talk to a therapist before pursuing the hypnoses thing, see if they advise it. If you're dealing with a lot right now, they might not want you to pursue it quite yet. Or they could think it'd be a way to help you sort through everything and advise it. In the end, its about what you think you can handle and what's best for you.