My Husband Has Been On Plavix, 325 Aspirin And Warfarin

My husband has been on Plavix, 325 aspirin and warfarin since 2002. His doctor just changed his warfarin to eliquis because his blood levels started being too erratic. Most of the people we know who have heart conditions do not take Plavix this long. He has suffered for over a year with dizziness, sometimes so bad he has to hold onto something to keep from falling. He has seen his cardiologist, family physician, ear, nose and throat and nuerologist. None can tell him what is wrong. Can Plavix be a problem?