Query regarding H2 blocker. Ranitidine?

I have a problem of GERD. So my doctor prescribed me Ranitidine 300mg OD and it's been almost 2 yrs since I have been taking it. When the doctor prescribed me this drug he told me it's safer than PPI and treats the GERD problems effectively than other H2 blockers. But now it's proven that Ranitidine is carcinogenic and it has been banned in our country. My doctor denied all these allegations as he said that it is safe and I shouldn't trust the rumours. How can he even say that ? A doctor should know what drug he or she is prescribing and if it is prescribed for a long term then what are it's side effects on body ? My doctor has made be consumed carcinogenic tablet . I ask you what should be done now ? Am I in danger that I had been consuming this drug ? Is there any other safe H2 blocker which is effective and equivalent to Ranitidine ?