Don't wait. At least call someone. Banner has a 24 hour line, (I don't remember the #, as does Cigna, if you have that insurance. At least call 911 and have them xfr you to someone (usually a paramedic) to answer the question.
As far as the albuterol, My daughter also gets bad bouts that bring on asthma symptoms, although the doctor says she is not an asthmatic. She has both Pulmicort and Albuterol. I THINK the Pulmicort is for prevention - one I only use when she's in danger, and the other I use when she's wheezing - we've also used both at one time, but DON'T do that unless the doctor says to. She's also had to use Prednisone to help open the airways. Call the doctor in the morning to get in - Camelback Pediatrics in Phoenix gets ours in same day if they are sick. We've been with them since our kids' births.
Also, in my little girl's case, she simply kept getting sick, so the Dr. recently did a blood test to see why. While no major reasons came back, as far as serious stuff, her allergy count was way high. It should be about 60 and hers was over 200 (mom's trying really hard to clean deeper, and I have to be careful because even the cleaning agents can cause problems). I imagine it has to do with the histamines her body is putting out. He's referring us to an allergist.
To ease your mind, I'd call 911. I had an issue myself a couple of weeks ago and the paramedic they connected me to was so helpful. In my mind it probably wasn't an emergency, but in theirs it could have been and they wanted to send someone out right away. They made me promise to call them back in 1 hour with an update (I was hemorrhaging and had two little kids with a traveling dad), or they would send someone to my home to check on me. The rule is that if you have an issue breathing, it can be an emergency. I'd be safe over being sorry.
Let us know what you find out. Ask the doctor about getting a cool mist humidifier. I don't find it helps a lot, but it's so dry here, I know my kids would be worse if I didn't use it at times.
By the way, I detest ERs too, and much prefer Urgent Care when really necessary.
Also, put little one in the bathroom and turn on the shower (the smallest bathroom you have, obviously). I used to sit for 20 minutes at a time with my son in a steam filled room to help him. It does help...for awhile.