Reality mirror. Part I. Shards of the future

Twenty-second century of the human era. Promising, but disillusioned with his work, scientist Sergei accidentally creates a device that opens a portal to another reality. There are completely different laws of physics, insects the size of a seagull, but most importantly, being on the other side of the portal, you are cured of any disease. But it is worth going back, as all ailments overcome again. How can an accidental invention divide the lives of many people into before and after?