Surgical internships are very intense (as is residency), and especially in this first month where you're new and figuring everything out or may be required to be there more as you learn the norms of how they want things done, how call works, etc., you may be there many days in a row for some portion of the day. I can't quite tell from your post, but are you working those ER shifts voluntarily or does your program make you do that?
Without knowing what you knew going into it, it's hard to say "is this too intense." Did you speak with current/prior interns at this program before you applied to it? If it was through VIRMP, what did their description say to expect? Surgery internships are not easy. A surgery residency is not going to be easier. It's going to be rare to have >24 hours where you don't have to go into the hospital at all most of the time. That doesn't mean that you can't take care of yourself, but it takes a lot more active effort on your part to force it into your schedule. You're not going to have a plethora of days where you can be a potato the whole day.