Maybe it's because you meditate in the wrong way. There is a similar article in Zhihu. I've been meditating for some time, and I've met many times when I'm in a bad state. This is because I practice by myself, without the guidance of my tutor. Without correct meditation, it will get worse and worse. If you practice by yourself without a tutor's guidance, you must remember a major premise: any meditation should be carried out under the premise of relaxation and calmness.