Your health and sanity come first. I realize that you're a college student and don't want to "fall behind", but those things are not as big in the grand scheme of things. It's better to go inpatient now (if that's what your medical team advises) than to let things exacerbate further, and it's better to be completely honest with your psychiatrist.

I'm a junior at a highly competitive and prestigious university, and I was in a similar place to you when I was a freshman. Scared, I withheld things from my psychiatrist and psychologist that impeded my BP diagnosis and proper treatment, even though I had to be hospitalized over three times (I lose track). Eventually I took a year off to take care of myself. Do I regret it? Not at all. Sometimes the fear of slipping causes more damage than taking the leap to ask for help (and to be completely honest when doing so).

Let me know if you'd like to talk more, or if you have any questions. I'd be happy to help in any way I can. Good luck.