Vocabulary: OVERWHELMED. To feelings or situations? Or both?
It'd say good....

1) I never feel overwhelmed by him

2) I always attempt not to be overwhelmed by the pressure on my job.

3) My boss makes me feel overwhelmed when there are too many people having dinner at our restaurant

4) I was overwhelmed in exams period at the university years ago.

Question

Vocabulary: OVERWHELMED. To feelings or situations? Or both?
It'd say good....

1) I never feel overwhelmed by him

2) I always attempt not to be  overwhelmed by the pressure on my job.

3) My boss makes me feel overwhelmed when there are too many people having dinner at our restaurant

4) I was overwhelmed in exams period at the university years ago.

Answer

I have some suggestions for your sentences :)

1) He never makes me feel overwhelmed.

2) I always try not to get overwhelmed by all of the pressure (or stress) of my job.

3) (Might need some more detail in order to make good sense - why does your boss make you feel overwhelmed?  It seems like the crowd of people would be the overwhelming part.)

4) At university years ago, I felt overwhelmed when taking exams.

Good luck!

Answer

Yes, you can use "overwhelmed" for both feelings and situations, but you need to write your sentences again. All of them either have a serious mistake, or are unclear.