@lucybunyard
When you say you feel the crown, does it feel too big, or painful? If it doesn't fit correctly with your bite, it may start moving teeth from extra pressure, and that does hurt. Did you ever have orthodontics to straighten your teeth? I remember that pain every time they adjusted the pressure. A tall crown can send pain into your jaw and uneven pressure on the joints of the jaw with the skull where there is a disc in the joint. Uneven pressure can throw the jaw out of alignment which causes pain. I get that occasionally because of an issue with my neck.

From your last post, it sounds like the crown is too tall and is putting pressure on the opposing teeth, and the dentist ground the biting surface to make it smaller? That sounds questionable to me, but I'm not a dental expert. Every time I got a crown, it fit and there was no adjusting with grinding it. You could ask to go to the lab and let them see how it fits. They should be able to judge this. That being said, I don't know how good the lab is. My first set of crowns didn't fit at the margin (next to the gums). They had a edge I could feel there and a "shelf" that trapped food particles and it caused it to decay under the crowns. The margins need to fit like a natural tooth.

If this problem is more than pain from a badly fitting crown, and perhaps caused by immune responses to metals, You could replace the crown with a non metal Zirconia crown if the tooth is sound. You may not be able to determine if the metals are the cause. In my case, I couldn't connect it, but when metals were removed completely from my body, my asthma and breathing improved a lot, in addition to the thyroid condition, and when metals were put back in when I broke my ankle, it made the asthma worse, so that seems conclusive. Replacing a crown is an expensive choice. Removing a tooth and going through months of healing and getting implants and a new crown is also very expensive. The Dallas practice does testing, and may render an opinion if there is an immune reaction to metals. There are a lot of bad dentists. I have had my share of them, and also some excellent dentists, so I know the difference, and working at a good dental lab taught me a lot.

I don't know what the dental lab offers. Dentists tend to work with the same labs as regular customers. It is possible that the lab can make a new crown without metals in it. The lab that my dentist uses carves crowns out of a block of Zryconia. It is computer controlled. Then it is glazed with porcelain and fired. There are no metals in it. My dentist is a biological dentist. That may be the key to getting crowns without metals.

I used to work in a dental lab, and the old way crowns were made is to make a metal coping, then paint it with a tooth color. It gets fired, and then porcelain is built on that by hand, fired, then ground to have correct shapes and fit with the bite on the model. It is then glazed and given a final firing.

The lab may also offer a Zyrconia only crown, but you need to ask that. I don't know what your dentist will be willing to do and it may be a very difficult conversation to have. If you find out what lab was used, you could see if the lab will talk to you about options.

The lab that made my teeth is in Northbrook, IL and this is where I worked years ago. If your dentist needs to find a lab for Zyrconia restorations, he could contact them.
https://www.dentallabprofile.com/dental-labs-northbrook-il-schroeder-dental-laboratory-10182/
It sounds like you need a medical provider who can render an opinion about defining the issues specifically. I don't know what your best choice is. This conversation may upset your dentist and end your relationship. If they tell you nothing is wrong, and you are pointing out what it wrong, it would be a very uncomfortable situation. Are you considering a new dentist? I'm sure this is a difficult position to be in and very upsetting. What do you think your next step should be?

Jennifer