Sue- For heavy metals you can have your blood chelated by a doctor of do it naturally.
Allergies raise ones internal inflammation. What you are saying about antihistamines makes sense. I am an allergic person, developing many allergies to elements, even natural like metals and rubber in middle age. I also developed several allergic forms of eczema. Out of desperation a fellow Mayo blogger told us about fellow suffers of one of my forms of eczema, Grover's Disease, GD doing a heavy metal detox using cilantro. GD is chronic, coming and going with no know treatment of relief from the rash, pain and itching.
Heavy metals are now being tied in to Parkinson's, Alzheimer's and GD. If allergic to heavy metals your histamine level is elevated. This sounds crazy, but our Mayo Connect GD group tried this and about 50% of are free of GD today, I am one of them after dealing with it for years. Cilantro is a natural way to detox the heavy metals. It could tied to GD, but perhaps it is a way to detox other allergens form Bone Cement.
I also have knee issues and because of blood testing learned of my metal allergies.
I cancelled my forthcoming scheduled knee replacement due to blood test results to metals.
Go to the Mayo Connect GD site and read around mid Feb 2019 to a post by Kimass1 who first mentions the benefits of cilantro she read about on an earth clinic site and our progress can be followed.
You may be handling this implant better, yet if you have not done so already why not get rid of your heavy metal build up and possibly this could help with future rejection.