What action should I do if my employer is not telling me the status of my employment?

I am not sure if my boss laid me off. I went on disability for 3 months because my boss told me I could not wear a mask to work. I was wearing a HIPPA filter mask because I got ill on and after construction work was being done at work while at work. During that day, I got sick with red itchy eyes and rash around my body. It did go away but I was wrong not to file in writing what happen I just told my manager and pharmacist. Then I was always getting sick, my doctor would have me off for a few days and I would get well, then when I returned to work, about two days or so, I would get sick again from my lungs to sinus infections. Doctor said it was work related and he put me on disability until I saw a specialist. My boss also said I had to go home until I got a clearance from my doctor saying I can come back to work. All this took 3 months. When I got my release form I emailed it to human resources, my mangers and owner of the company. I also got a phone call that day from a manager saying that the other manager/human resources said I was no longer needed until further notice and until I receive a phone call from this other manager. I emailed and left message to the owner, and human resources asking if I was laid off, or what was going on, but no one will return my calls or emails. I don't know what to do.