It is not unheard of for these problems to occur with this sort of long meditation retreat, but it is rare. The beginner's mind is not used to spending so much

It is not unheard of for these problems to occur with this sort of long meditation retreat, but it is rare. The beginner's mind is not used to spending so much time in this state, and it can lead to hallucinations or extreme discomfort. That's why most sanghas and retreats require people to build up to these longer retreats. Those who have mental disorders, whether under treatment or not, should go slowly with meditation and should keep a journal and keep in contact with a counselor. There are psychologists just about everywhere who have mindfulness and even Buddhist training, and who can help to guide people through this safely. There are enough benefits to meditation that it is worth working with a counselor to ensure that it is done safely. Those with certain forms of psychosis should probably avoid meditation, as it can alter brain patterns in a way that sidesteps the coping mechanisms one has been taught. Long retreats are unnecessary for reaping the benefits of meditation or mindfulness. Think of these long retreats like marathons. They are incredible experiences for those willing to put in the hard work to train for them, but most people get all of the health benefits they need from 30 minutes worth of exercise. I have not yet gotten to the point of doing a long retreat in my own practice, but I am working up to it. Fifteen minutes a day and a little dedication will do it. Never bite off more than you can chew. Also, note that if you are having a traumatic experience or suicidal ideation -- no matter the cause or when it occurs -- stop what you are doing and please immediately seek help. Meditation can turn up things that are difficult for some people to cope with. There is nothing wrong with getting a little help to deal with these things.