Allergies! :(

I'm still pretty up set and worked up about this so please excuse my rambling and length.
My DH has really bad allergies.  Needing shots allergies.  My LO I fear is on the same path.  The last week or so she was coughing in the morning, and slight runny nose.  Nothing during the day or night, no fever.  Yesterday morning she actually vomited phlegm.  Her nose was all stuffed up and coughing for about a half hour.  That night she had coughed a couple times in her sleep.
Last night on our way home she was freaking out.  Crying so hard she was choking herself.  I had to pull over twice.  My DH passed us on the way home and stopped and saw her freaking.  He said it looks just like an allergy attack from when he was a kid.  Earlier that day her eyes were red a puffy and she was rubbing them.
Then came this morning.  I've been thanking god over and over again today that we are co-sleeping.  Even my DH- who has been pushing really hard to get her out of our bed said the same thing.  She was gagging and choking on the phlegm and vomited that up.  Her nose was really runny/stuffy (if that makes sense).
So off we went to the Dr.  She said it really sounds like allergies but because she is so young she doesn't want to diagnose her yet.  For now she said hope its a cold....
Thank god she is sleeping with us.  Thank god I am exclusively nursing.  I couldn't imagine how much worse they would be if she was on formula.  I don't even want to think about what could have happened had I not been right there this morning.