Feeling dead

Just lately I have been feeling dead inside, I can't smile, cry, scream with anger. I tried watching comedy a few days ago but I just turned it off. Tried listening to a sad song to make me cry then I might of felt better but still nothing, I had sex because after I always feel refreshed and happy but nothing.

I can't take meds as I take them all.

The only person I can talk to is my dad but telling him will upset him so I don't want too.

Is it normal to just have phases like this. I can't so anything without feeling a little emotion either good or bad. I'm only eating a few mouthfuls a day and I can't sleep,