Deworming medicines are only recommended to use with serious infestations by the organic farming institute in my country (Louis Bolk). A chicken can handle the common worms as long as she is not sick. Deworming medicines are not good for a chickens health unless you really need to bc of a severe infestation. After deworming the worms always return if they have established themselves in the coop/run/environment.Make sure you check out how long you have to toss your eggs if you use Aquasol. I can't remember but I know that I read that on here a while back.
I have chickens for 10 years now and after an unlucky start with sick chicks, I only had two hens that died of somekind of illness. One got a waterbelly after laying soft shell eggs, and the other died suddenly during the night (possible heart attack or a stroke). I had chicks that got some kind of cold, but they all cured without medicines after several weeks.
Many wild birds like sparrows come into the run and my chickens free range several hours on most days. It makes them happy and healthy. I did have red mites in the coop last year, but I managed to battle them.
All in all, I believe you have to learn to accept that things can go wrong. Chickens just don’t live forever. Giving a good space, fresh air, clean water and healthy food is most important imho. I never went to a vet with my chickens and don’t plan to do so for as long as possible. I also prefer to buy hatchery eggs over chicks to lower the risk of transmitting diseases.