My thought is that perhaps you are reacting to the new HFA propellant that's found in both Symbicort and rescue inhalers. Some people on the board have problems with the HFA propellant. You might try using a spacer and see if that helps disperse the propellant enough so that you don't have problems with it. Unfortunately, all of the metered-dose inhalers now use the HFA propellant, so it's hard to avoid it.
You might want to talk to your pulmonologist about a dry powder corticosteroid inhaler such as Asmanex, and the dry powder inhaler Foradil (the long-acting bronchodilator med found in Symbicort). Using Asmanex plus Foradil together would give you much the same effect as Symbicort. However, some people develop hoarseness when using dry powder inhalers, since some of the powder tends to deposit on vocal chords. Also, dry powder inhalers contain lactose (milk sugar), so if you're allergic to milk those would not work well for you.
Alternatively, the specific steroid in Symbicort (budesonide, or Pulmicort) is available as a liquid to be nebulized (Pulmicort Respules), as is Foradil (under the name Perforomist), so nebulization would be another possible way of taking these meds, although much more of a hassle than using an inhaler.
Hopefully these thoughts help give you some ideas to take back to your pulmo and discuss with him. Take care and good luck. Judy