Q: Earlier today I signed into a different account. When i signed back into the account that I use or apple music none of it was there. I do I get my apple music back?

Your Apple Music is only available from the Apple ID account is was purchased from.

Did you sign into Apple Music with the other ID? Or download purchases that that ID purchased in the iTunes or App Store?

Are you connected to Wifi? Do you have iCloud Music Library turned on under Settings>Music?

GB

First do a forced restart:

Hold down the Home and Wake/Sleep buttons at the same time for about 15-20 seconds until the Apple logo appears. You will not lose anything.

Then follow the steps here to enable Apple Music again.

Sync Apple Music across your iPhone, iPad, iPod touch and computer - Apple Support