You learned something from this. I get where you are. You should have pushed something but you were too intimidated to do so. You should have pushed it because it has become THAT important to you that it’s bothering you terribly.
It’s very late right now, but yes, you can tell your counselor that you cannot accept Cornell’s aid offer and that HPY look like they can give you the money you need so you want to apply there and turn down Cornell, and go to a safety school (hopefully you have) that if you do not get accepted. Understand you have let go a bird in hand , but I’m sure you will get into other colleges, but the chances of getting into a school more select than Cornell are minuscule.
You then proceed to send your HPY apps out. And see what happens. All you do here is lose the Cornell option. If you can’t get hold of your GC, then do it yourself. Reject Cornell. For insufficient aid and get those HPY apps out by 12/31 and have your counselor send your transcripts and LORs already in file when you get back to school next year.
I cannot tell if your counselor was a bully in this or not. Sounds like it could be typical and you were not assertive enough. When I was applying to college, I had to push , beg, cajole, remind , check up on my GC every step of the way. Back then, everything had to be redone by hand—copy machine not prevalent and I applied to a half dozen colleges that required personal work on the teachers’ and GC’s time, when applying to 3 colleges was a lot. My kids GCs had to be pushed and directed. My son lost out on a scholarship when a teacher didnt get LOR out in time. Son needed to be on top of it and he wasn’t. I still burn over that one