I did a vipassana course after a similar suggestion. In me it triggered a full blown manic-psychotic (bipolar) episode. There had been no history of this in my family (or myself) before that point.
If you're interested, I made a bunch of podcasts detailing what it was like to be manic -> depressed -> better here: [0]
While I'm not saying it's necessarily bad advice, I suggest that anyone contemplating a 10 day silent retreat has prepared by doing a _lot_ of meditation before hand and to be aware that there can be consequences.