First...you need a hug -- (((meeppeep))) :icon_hug:
Second...as a new grad of three months, you should NOT be on your own on a specialty unit in the first place. My question to your nurse manager is: How the heck did that happen under his/her watch?
When nurses choose to not start out on med/surg floors, and yet choose to start out on critical level specialty units to begin their learning as a nurse out of school, this is often times what happens to them...not all new nurses...I said "often times...for some...".
Now that you are there, perhaps you should stick it out, but ask the union for help in extending your orientation under a preceptor who knows how to orient new staff...especially new nurses. Cardiac is complicated enough when you have experience as a nurse in other departments let alone as a new grad.
If Cardiac is NOT your first love of nursing, seek a different unit to orient on. I recommend Med/Surg. On Med/Surg, you get a variety of diagnoses to learn from, a variety of pharmaceutical meds to master, and patients who will be admitted with histories of old cardiac diseases secondary to their admitting diagnoses. This will give you the variety you need to ease your way into the nurses profession.
Med/Surg is a specialty in and of itself...always has been, but many new nurses will avoid Med/Surg because they think it won't be challenging enough. Believe me when I tell you this..........it is DEFINITELY challenging enough, especially if you take on med/surg in a university hospital.
I wish you well. Let us know how things go. :icon_hug: