、。
I'm so excited I can't eat anything.
Literal
I [topic-は] excited-being, anything throat [object-を] not-pass.
興奮する (こうふん, 'to be excited/agitated') in ~していて (ongoing + sequential). 何も喉を通らない ('nothing passes through the throat') is an idiom for being unable to eat — the excitement has killed the appetite.