Hair stylists are mind controlled to believe that shampoo and silicones are the holy grail. Anything else will cause xyz.
Hair loss is caused by your genetic profile or disease. There are many communities around the world that live with scalps that are seldom cleaned but have no less incidence of balding heads than "cleaner" communities.

Do I believe co-washing is causing your hair to fall out? No.
But there is a reason your hair is falling out and you need to find out why. can be anything from stress, poor diet, medications,, vitamin deficiencies, thyroid issues, autoimmune disease like lupus, anemia, and the list goes on.

For me, I lost my hair from lupus and the medications used in the treatment. Rogaine and Biotin have restored almost all of my hair.
I use Rogaine 5% (generic version) and Biotin 5000mcg. Rogaine takes 6-9 months to notice any change but since it's affordable (20$/3 month supply), it's not a big waste of money and there's little time commitment.