Great job Aurora! Your English is pretty good :) This is my first time correcting but I hope this helps:

I have to describe situations when I had bad and good feelings or sensations.

1. I have had bad experiences working with ''toxic leader''. This has been a troubled time for my team and I. If I could, I would rather do the hardest work on the planet in that time than communicate with that person. My team and I had very similar somatic symptoms. After meetings with him we felt the onsets of headaches and apathy. We did not want to work. My usually feelings were: anxiety, helpless and deep sadness. I was annoyed and tired.
2. When I think about children I always feel well! Communication with children is the most interesting thing to me. It is as if I am in another world. I do not feel anxiety and I am not tired. When I see children's smiles or I hear children's laughter, in one moment all my problems go away. My usual feelings when I think about kids are: caring, hope, lightness, joy, responsibility, helpfulness, admiration, inspiration, and so much more.