Cat blockage please read! please urgent?

Okay so i have an appointment for him tomorrow at 1 in the afternoon. It is currently 7:45pm, to make sure he is okay until then should i leave him alone, stay with him and watch him, let him eat, let him drink, no food or liquid, or what? please help i have very bad anxiety and have been stressing all day, i am 13 and so i am very concerned. please help me save my cat overnight i have had him since he was a kitten and i love him so much! thank you in the future, okay so i posted this earlier but now he is bleeding little drops. I'm VERY worried now!