I'm going to suggest a few other things, in case you're alive.
Given any unknown medical conditions, the salt may have induced a coma. Sodium can increase blood pleasure and cause them to burst, which would indicate your nosebleeds. I'd just drink a lot of water for the next few days. Don't overdo it, just a glass an hour for about 8 hours. If you'd like, you can drink 2 and space the other 6 our until about 4 hours before sleep.
As for the demon, he probably isn't going to do much anyway. Not for a while. Demons take time to harm someone. If things don't get better in a few days, you'll have to consecrate the area you summon him and the whole house.
Don't let your anxiety get in the way of anything. Usually, what most people don't know, is that when you summon a creature, a part of it's living essence is attached to you. It's called harmonic resonance. It's a link but not life-threatening. Usually anyway but your neurosis in the situation is rather concerning. Just stay calm and take a few deep breaths and follow the advice above.
Also, try not to be so hard on other people your age. Karma occurs for everyone. Besides, there's other non-magical means for that.