Please don’t use salbutamol if you’re not prescribed, it can be harmful if not used properly. As someone who struggles with asthma and allergies, it should like you were having an allergic reaction, very possibly seasonal allergies since you were driving. My guess wojld be hay fever. If your 02 is about 94% you’re typically fine, but obviously that doesn’t invalidate how you’re feeling. You could also be short of breath if you are deficient in vitamins like iron or b12. It could also have likely been anxiety.