Is prayer obligatory for a chronically ill person who is close to fainting and unable to move, and how does he perform it?

Prayer does not cease to be an obligation for a Muslim as long as they are of sound mind. If one loses their sanity due to madness or faints, prayer is no longer obligatory for them, and the preponderant opinion is that they are not required to make it up. A sick person prays according to their condition: if they cannot pray standing, then they pray sitting; if they cannot, then on their side. If they are unable to move, they pray on their side, with their face and chest directed towards the Qiblah, and they gesture with their head for bowing and prostrating, making the prostration lower than the bowing. It is preferable for them to be on their right side. If they are unable, they pray lying on their back with their feet towards the Qiblah, and they gesture with their eyelids if they cannot gesture with their head. If they cannot find someone to direct them towards the Qiblah, they pray however they are able. If they are unable to do so, they pray by repeating adhkar (remembrances of Allah) with their tongue. If they are unable even to do that, then they pass them through their heart, relying on Allah’s saying: "So fear Allah as much as you are able" and "Allah does not burden a soul beyond its capacity." Prayer does not cease to be an obligation for them as long as their mind is sound.