First off take a deep breath and calm your energy. You have a bird who doesn't know you from Adam and who is pretty scared. He's had his beak trimmed, which in and of itself is traumatic, which could explain the bleeding, maybe it was abraded too much? Why did he have his beak trimmed? Is it over growing? If so that could indicate a medical problem with the liver. Beak trimming should not a "norm". You need to put him in a place he feels secure and safe. Where is your cage located? Do you have a sleeping cage? Bird time and human time are not the same. 3 days in human time ='s about 3 minutes in bird time. He's scared. I know you need to give him his meds but I would try and find something that he likes to mix it with. The main thing is to talk to him in a soft soothing calm voice, tell him everything your going to do and why, move slowly, minimize the touching if possible and don't wear any loud clothing or baseball hats.
Ginger