new grad 6 months on the job- 2 med errors-1 pyxis error

shoot me now! i feel so defeated and on the verge of tears. made my second true med error tonight. just 2 weeks ago my manager spoke to me about a med error. here's the scoop:

first error was made during an override in the pyxis. i selected the wrong patient but gave the correct med and dose to the correct patient. i realized the error and wrote an incident report. my boss asked if i learned form the error and what could i do to make sure it doesn't happen again. i got let off easy.

second error was made because an old dose of BP med was not D/c'd on the MAR and a new dose was written. this resulted in 3 doses instead of 2. one transcription used the brand name and the other used the generic and i didn't catch it. scheduled for 2 different time and other BP meds ordered as well. wrote an incident report again and called the doctor. my boss once again coached me and gave me pointers and a warning to protect my license. i walked away telling myself "i cannot make another med error"

third error was a stupid stupid error gave potassium when the parameters were to hold if <3.9. pt level was 5!!!!!!! what was i thinking? i just absentmindedly gave the meds. i had admitted this patient a week ago with a K level of 2. he had diarrhea nonstop for 2 weeks so i was familiar with his MAR and meds and didn't stop to check his level. nevermind that the nurse on the AM shift held it and the parameters were in red letters. called the doctor and she said don't worry because the patient will go to dialysis in the morning and to D/c all potassium because it should have been D/c'd after it was corrected.

will i have a job after this? will i be trusted after this? will i trust myself? will my coworkers feel comfortable following behind me? im sure i wont sleep tonight wondering if my boss will grow impatient with me. what happens if i make another mistake with meds? i need advice suggestions.

PS- the other new grads on my unit are doing just swell