Insurance Co. changed PCP without my consent?

The health plan I am on the Plan changed my PCP without my consent and I did not find this out until I went to an appt. I then went to the New PCP and she refused to prescribe as she does not believe in prescribing certain meds. Now I am out of the Meds and my original PCP can't legally prescribe until I get switched back on March 1 . It is only Feb 12 . Is this legal for my treatment to be abruptly stopped. Who needs to answer to this. ?