what should i do about new symptoms...

hey guys.. first some backgrounds... Now I'm 17 years old i diagnosed with asthma 4years ago and i tried to make my asthma under control but I couldn't and my asthma is kind of sever i use the highest dosage of symbicort.. the priblem is i have some new symptoms.... my asthma signs were chest tightness, shortness of breath, coughing alot, wheezing (but not always), breathing pattern disorder,fast heart beat, and also everyday asthma attacks.... but now I have pain in my chest, anxiety, feeling weak in my hands and leg, whenever i caugh i feel sever tightening in my chest and also i got throat tightness too... but another point is i can't use salbutamol for my asthma attacks cause it didnt worked on is there any other inhaler that i can use for my flare up's?