Concentraion & Memory Problems

I have had respiratory problems my entire life and was diagnosed 2 years ago with Reactive Airway Disease that has now been re-diagnosed as asthma after a recent acute episode and numerous pulmonary tests at the hospital. My question is, I am almost 51 years old and have always had a really good memory. The past several months I have become easily aggitated, confused and can't remember things I SHOULD be able to remember. Are these are normal symptoms of asthma or am I just getting old?? My employer REFUSES to accept my asthma and continues to put me in a position of being exposed to triggers (tobacco smoke, heavy perfumes & aerosol sprays) that cause asthma attacks and I work for a state agency. Do I have any recourse for this? I really appreciate this website and am finding TONS of information to help me adjust to and learn about my asthma.