My days aren't adding up and level indicator is gone
Twice in the last week I've gone back to zero when I was in duolingo. Also, Where is the level indicator? I have no idea how much I've done at the level I'm currently in or how much I lack getting to the next level.
I assume you are meaning your streak has gone. If you miss a day or do not reach your Coach target you will lose your streak unless you have bought a Streak freeze from the store.
The level indicator was taken away a long time ago but you can still get the same info for each language you are studying by going to your profile where you will see it on the right hand side.