Self Induced Coma
These don’t seem to be valid conditions. If it’s advised by an expert such as a doctor or a psychiatrist due to some medical conditions then it can become permissible. The entire point in Islam is that we go through the test of this life in order to get selected for the rewards in the hereafter. In the situations that you described above, one should instead seek help from God, doctors, as well as that from their friends and family. They should then do whatever is under their control and have faith in God that their situation shall improve with time.