Joe, it sounds strange to say this, but >in some way< these kinds of experience are normal. By that I mean that people who are actually apply the meditation technique over a 10 day period will probably have those types of experiences. 10 days can be quite intense, especially if there is a high degree of investigation and exploration and continuity..
To cut to the chase, it's great that you have a psychologist to talk to, but all you really need is for him/her to watch out for any signs that you are taking a bad turn. You're right that he won't "understand" it... and may even be threatened by it or might "pathologize" it. But all a psycholgist needs to do for you is see how you are now. Are you being good to yourself? Are you maintaining your responsibilities? Are you overly obsessing or ignoring? Beyond that, meditation is really a different realm of expertise. It can also be tempting to lord these experience over a psychologist ("I know something about mind that you don't know." Don't do that!

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Since you're posting on this site, you probably have a basic understanding of the maps and can see how a lot of the body movements could be the three characteristics nana, the explosions could be the "A&P", the disappear and come back with a glimps of the nature of reality could be "the A&P event", and feeling like sitting forever could be "equanimity". Your ongoing practice will help you figure out where you are on the maps, but it seems possible that you have essentially followed Daniel's recommendation: go on retreat early in practice and reach some practice milestones early on.
Just because this can be fairly common on retreat and can become a real problem, it worth mentioning those two kinds of scary stuff that can happen during someone's first intensive retreat.
The first is the "explosions" that happen when looking at knoted parts of the body/mind. These can lead to releases that are quite energetic. It's important to not blindly push into knots and release a lot of energy... these can be destabilizing, so explore but don't blindly push. Frankly, these openings are pretty cool, so there is a natural attraction toward this kind of exploration... but some of us tend to go too overboard about it. You can push too hard, so make sure there is some compassion in the mix. By the way, it's not rare for folks with anxiety issues to witness these anxiety sesations very closely during meditattion, essentially having an anxeity attack, but with such awareness that it doesn't become a threatening event, but rather a series of sensations. It can't be forced, but it's a common report of people who have a dedicated practice and are dealing with anxiety. This isn't a reliable treatment method, so working with a psycholgist still makes the most sense.
The second is the not-self/depersonalization type experiences. If anything, these seem to be the most scary. The sense of self drops away for a second, a minute, or maybe 10 minutes or more. It feels like you're being walked around, as if you are inside a puppet that someone else is controlling. There can be those wierd spontanious movements that seem to fix body pains, posture problems, etc. It can be kinda spooky. The caution above doesn't quite apply because there really isn't a sense of doing it or pushing it, it just happens. The best thing to know is that the self will probably come back online at some point, so best not to freak out. Eventually there will be more and more experiences of tthat kind of very light feeling of no-self, but the first time it's experienced it's pretty scary.
So good news it you lived through it, had some experiences, maybe some insights, and are back home. As is often noted, sometimes a dark night can follow a period of intense openings. Usually the best thing to do is to keep a gentle practice going and focus on resting in experience. No need to push like on retreat, just go back to basics and rest in breathing and noting/noticing. As you have experience, if you stay with the technique, experiences come on their own and insights follow. Remember that it's a meditators responsibility to learn how to balance effort and relaxation. Ideally, you will find a balance that keeps practice interesting and productive, but without freakouts and burnouts.
Best wishes!