What is a primary care physican's obligation to reporting results received from referrals?

My primary care physician has referred me to two specialist. I have been receiving treatment from this internist for several years and the two different specialist I've been sent to for two years. It seems to me that no one is communicating test results to one another and as a result, I have had an allergic reaction to the medications I've been receiving. Who is at fault for this lack of communication and who's responsibility is it to clear my reaction. I've articulated my concerns and have been taken off of certain medications, but I'm still experiencing an allergic reaction.