"Their website specifically says that if you have had psychosis in the past you cannot ordain or even go as a novice, since it would be a burden if your psychosis reappeared"
In short: that's the community's rule there, yet not something found as "Dhamma-agreement" in accordiance with the Dhamna-Vinaya and it's further not unusually that 'burdensome' get, out of compassion (one should be clear that there is not such as a right to ordain, but it's something which is given or not), ordained and maybe more a hint that not everything that carries fame in the world is really always worthy it.
Good, of course, to start associating, so that monks would know good householder good anyway and one should not think that people living at monasteries are generally viewed 'normal'. Yet not to speak of modern/western distinctions and SEAsians or even Dhammic. It's generally not so wise to prefer to seek a home in westernisationed/modernisationed communities but leave home first on a home level, into another nearby culture, nearby the heritage rather that modern.
In any case, good to not waste time and to use possibility to go forth, if one feels inspired and ways can be found.
Not only that outer conditions aren't for sure, intention and good aspirations are even more hindrances, as kusala isn't for sure and one is adviced by the Sublime Buddha to be there quick.
May good householder always remember that the Devas (not to speak of good and carefull monks) would open the doors for one after leaving home for the Noble Quest with a clear and honest heart.
And to pay approve of householder White clouds experiances in relation of heal. If the is a 'doctor' hwo leads to heal, then the Sublime Buddhha and his good disciples by use of the sublime Dhamma and practicing it. Medications of common ways may sometimes 'heal' for some time, sometimes not even that. Aging, sickness, death are sure, anyway, for one who took another birth. As for ending the wheel of stress, nothing else as the Noble path would really help.
(...and stop gaming of any kind! quick! nothing of permanent akusala cittas where one 'must' get 'stupid')