Singulair with the inhaler helped energy levels

To make a long story short when I was 17 I had "asthma-like" symptoms but nothing conclusive was found. Now i'm 24 and had a few good years when I lived an extremely healthy lifestyle but it kind of fell apart for various reasons but now i'm back on track. Back then I really didn't have problems with my lungs so I didn't care for medication etc. Anyways my lungs haven't felt good in a long time and I finally went to the doctor and they resumed medication with singulair and with the inhaler thing. Also, i've been extremely tired no matter how i live or sleep. I tried the inhaler once and excuse me but what the heck. Much easier to breathe but whats more interesting is the feeling of alertness and energy, I can safely say I haven't felt this alert since for ever. Maybe it's a bit premature but I find this extremely interesting and i'm quite pumped up about it so I decided to look into it and this is why I made this thread. Anyways am I imagining this? Any similiar experiences? Some freaky side effect?

Most inhalers have steroids. Steroids can cause that energy as well as an increase of blood oxygen. When your blood is not getting enough oxygen, it can cause confusion and fatigue. Pumped back up and the vigor comes back.