Oh no!Please help me!Dog problem!

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Ok my dog is acting all strange,it's shaking and is in its bed.I am really scared,what should i do?Should i call a doctor?I really like my chihuahua. It's a 12 year old chihuahua named Puffcake and she is sick i think?Is there somebody here that can help me with this so i dont have to pay for a veterinarian?Please!Help me!She overeat a little bit but she does that all the time.She is barely responding to my calls she almost doesn't move.I'm scared.help Mozzak.