Turning to Heating & Air Conditioning to stop dust sensitivities

I have never gotten our Heating & Air Conditioning ductwork cleaned out.

My nurse told me to take a double dose of antihistamines. This is because our dust sensitivities have been bad for the past few months. I am getting constant sinus infections. I have just been angry. My dust sensitivity symptoms did improve once I doubled the dose of the antihistamines. However, I started getting severely exhausted all of the time. It was hard to keep our eyes open at work. All I wanted to do was sleep. Now our nurse is saying that the antihistamines are to blame, even if they are “non-drowsy” they still can mess with your ability to stay away. Especially if you take 2 every morning. So now I’m back down to 1 antihistamine per morning & I’m less exhausted, then but our dust sensitivity symptoms are also returning. I have decided to try to get to the root of our dust sensitivities. I got an air filter for our cabin with a strong MERV rating. I also got a few portable HEPA filters & localed them throughout the house. Then I read about ductwork cleaning. Apparently you are supposed to get your Heating & Air Conditioning ductwork cleaned out every other year. I have never gotten our Heating & Air Conditioning ductwork cleaned out. I wonder if that could be a cause for our dust sensitivity symptoms? I guess it could be so I have already set up an appointment to have Heating & Air Conditioning workers come out & wash our Heating & Air Conditioning ductwork. I hope all of that works & that I start feeling better without a ton of antihistamines. I’m getting sick & exhausted of being sick & exhausted.
Hybrid HVAC system