I am currently experiencing severe bone & joint stiffness.

I also have stiffness ++ one year post TKR
I also take vitamins , Omega and have some degree of immunity to metals. I am chalking up some of these symptoms to metal allergy which I think increases with age.

jaylo76, is the stiffness related to the autoimmune disorder. It sounds as though you are not being treated for autoimmune. Asymptomatic? It might be a good idea to contact the diagnosing physician.
I get stiff from being the same position too long. Sitting, standing or lying down. If you are on an inflammatory diet you might try eliminating sugar and highly processed foods. You don't want to just bear with it because some of these causes can cause permanent damage to your joints.

Is it the statin? Just a thought.

Consider seeing your doctor for testing of systemic inflammation.
ESR and CRP can be helpful guides. CoQ10 is helpful as it is anti inflammatory.
Mediterranean diet can help. Work on diagnosing your symptoms.

This is from the Mayo clinic guide:

What are statin side effects?

Muscle pain and damage

One of the most common complaints of people taking statins is muscle pain. You may feel this pain as a soreness, tiredness, or weakness in your muscles. The pain can be a mild discomfort, or it can be serious enough to make it hard to do your daily activities.

However, researchers have found a "nocebo effect" when it comes to people thinking they have muscle pain from statins. A nocebo effect means people who expect a negative side effect from a medicine report experiencing the potential side effect at higher rates than the medicine should cause.

The real risk of developing muscle pain from taking statins is about 5% or less compared with taking a placebo. A placebo is a pill that doesn't contain medicine. Studies have found that people stopped taking the pills because of muscle aches even when they were taking a placebo. A strong predictor of if you'll experience muscle aches when taking statins could be whether you read about the potential side effect.

Very rarely, statins can cause life-threatening muscle damage called rhabdomyolysis (rab-doe-my-OL-ih-sis). Rhabdomyolysis can cause extreme muscle pain, liver damage, kidney failure, and death. The risk of very serious side effects is extremely low. Only a few cases of rhabdomyolysis occur per million people taking statins. Rhabdomyolysis can occur when you take statins in combination with certain medicines or if you take a high dose of statins.

Who's at risk of developing statin side effects?

Not everyone who takes a statin will have side effects, but some people may be at a greater risk. Risk factors include:

Taking multiple medicines to lower your cholesterol.
Taking medicines that interact with statins.
Taking the highest dose of any given statin.
Being female.
Having a smaller body frame.
Being age 80 or older.
Having kidney or liver disease.
Drinking too much alcohol.
For some statins, drinking too much grapefruit juice.
Having hypothyroidism or neuromuscular conditions, including amyotrophic lateral sclerosis (ALS).

Also, my doctor recommended that I take coQ10 to prevent side effects