I have had a lot of lower back pain this last year. It's my kidney that sore from detoxing heavy metals and from kidney stones. Sometimes they were so sore I could not completely bend over. Sometimes the pain will radiate out feeling like it's my leg hurting or my outer hip. At one point I would have trouble with what felt like my sciatic nerve hurting but now I am not so sure that wasn't my kidney. I would do sciatic stretches for a week and it would go away.
My first two rounds of kidney stones I drank apple juice and did caster oil packs. The stones moved slowed and took a week to dissolve and move out. This last time by coincidence I happened to be eating a lot of Watermelon and melted the stones in two days. I am assuming they were uric acid stones since from there I had gout for a month and a half. I realized the reason for the uric acid stones is that I was detoxing copper and copper raises estrogen. As I detoxed copper it would lower my estrogen. Estrogen actually helps to detox uric acid out of your body.
As far as the anxiety, heavy metals can cause that. It will happened when it comes into the body, when it leaves the body and anything that stirs it up. Heavy metals also cause chronic inflammation but inflammation goes hand in hand with AF. It is very important you take an anti inflammatory I used Relora but have also used Boswellia. Doctors now think that inflammation is the root cause of most disease. It also will keep your body in flight or fight mode.