As a last resort, As a matter of course and as a matter of fact [American Idioms]

As a last resort

1. as the last choice
2. if everything else fails

• Call the doctor at home only as a last resort
• As a las resort, she will perform surgery

As a matter of course

1. normally
2. as a normal procedure

• the nurse takes your temperature as a matter of course
• You are expected to make your own bed as a matter of course

As a matter of fact

1. actually
2. in addition to what has been said
3. in reference to what has been said

• As a matter of fact, Tony came into the room while you were talking about him
• I´m not a poor worker.  As a matter of fact, i´m very efficient.

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