Dead bug

I have a bug 
on my server survival I tried to deploy my elytra, and after this, i lost all hearts in my hp bar, i cant use chest,
the mobs do not see me and i cant get killed by a /kill

help me pls i dont want to lost my game ... and sorry for my bad english

 (sry for spaming but if you have the solution give me the link or help me but why you close the topic) ....