How serious is asthma? I'm 27 and have had allergic asthma my whole life but never used albuterol unless near a cat etc... It's getting worse now...

Can be fatal. Reactive airway disease, of which asthma is a subtype, can be fatal. During an asthma attack, the 'air tubes' or bronchial passages, constrict. In severe cases they can fully close, causing suffocation. Avoiding your triggers (and cat dander is one of the worst) is very important, as is keeping an albuterol 'rescue' inhaler close at hand.
Very Serious. Asthma is a chronic inflammatory condition that leads to almost 5, 000 deaths per year in people poorly controlled or not taking medications for symptom control. You must see an allergist for testing and consideration for appropriate medical intervention.