How would you say "i don't feel well" in spanish? also, what's the infinitive of the word for "to feel"?

Bernardo, a school administrator, is constantly working with the employees, teachers, students, and families at his school. he is constantly hearing about problems in the school and areas that he needs to fix immediately. which skills could bernardo best use to keep calm when dealing with all the problems? stress-management skills classroom management skills time management skills instructional design skills organizational skills