When I started out in internal medicine, I had a similar situation with my first call being on the MICU on the first day of my intern year. We don't cap the ICU admissions, for obvious reasons, so we took 14 admissions that night, of which 8 were legitimate (AMI, GIB, decompensating CF). We covered three ICU's (MICU, CVICU, SICU) on separate floors and by we I mean myself and a second year resident with little confidence in her abilities.
All three GI bleeders required bedside scopes and immediate transfusions, but thankfully, only one had access issues and I was able to put a L subclavian cordis into her. Two out of the three MI's were unstable and came in simultaneously. We stabilized one while the other one went emergently to the cath lab with tombstone T's and an SBP of 50. That guy came back on IABP (great for the intern who knows jack about anything, much less a balloon pump) and coded twice later in the evening before finally stabilizing.
The worst was the 19 year old CF patient with intractable pseudomonas pneumonia. Difficult airway (small, high, and anterior) but success using just the stylet with a strand of silk tape tied to the other end, to get between the cords, then threading the ETT over that contraption. Able to ventilate thereafter but she was already septic and requiring Levophed and vasopressin infusions. Family let her go two days later.
Don't even talk about the existing patients. All told, we ran 9 codes that night, with two chest tubes, multiple central line placements and art line redos, and I didn't have time to write even one procedure note, much less an H&P. I was exhausted, terrified at times, but exhilirated in the end because not one died on my first watch. I finished my H&P's, progress notes, and procedure notes by 5 pm the next day and walked out of the hospital feeling pretty damn confident . . . and promptly fell asleep at the wheel and ended up back at the hospital with bruised ribs. Finally made it home at 11 pm to sleep and was back in the ICU by 4 am.
It wasn't pretty, but I never had confidence issues after that month and I wear my gray hairs from that day with pride.