I hope that by now, you've already been to the Hospital. If not, I agree with the others, get there immediately!!
I have anaphylaxis with five classes of antibiotics, and e-myacin is one of them. If I were you, I would've been at the hospital already.
Don't assume that just because you've taken 3 pills and haven't had a problem that you won't. On a few occasions, I've taken half a bottle of medication before suddenly having a reaction. With Duricef, I'd been taking it quite frequently for about six years before I had a reaction. So, please remember, reactions do what they want and are quite unpredictable.
It's best to remember that if you've had a severe reaction in the past, your chances are quite high of having another one (with a different medication, even) in the future. Also, if you've had a severe reaction in the past, it may be a good idea to ask your doctor for an Epi-Pen to carry with you. Believe me, it can save your life.
I wish you the best!
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-Shiloh
Emergency 
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