I miss my girlfriend...?

i havent talked to her in about 24 hours and its driving me crazy. weve been together for about 4 months and things are pretty serious already. we have talked almost everyday, but today we havent talked at all and im beginning to worry. i miss her so much and i know it sounds ridiculous not talking to her in 24 hours, but im not used to it so it feels like much longer. ive texted her several times. called her several times and facebook messaged her and emailed her. those are the only ways i can contact her and she hasnt responded to me yet. i just dont know what else to do...i mean what if i never talk to her again? i'm just really worried and sad. what should i do? whenever i call it rings a few times before going to voicemail so i know her phone is on, but sometimes the numbers of the rings changes from 1-3 so im thinking that i may have made her angry...in fact so angry she wouldnt want to talk to me. i just wonder if shes thinking about me. she has never been this mad at me, but i know i didnt do anything. i am in a strange state of mind. any advice or personal experiences would be greatly appreciated. thank you.