I'm so sorry you are having to deal with all of this. It is so hard to not feel well and then have to deal with a dismissive dr on top of it all. I wouldn't hesitate to get another opinion. Starting with your PCP sounds like a great idea.

Keep a symptom journal. Also, take pictures or videos of unusual things if you can such as a muscle in spasm or odd swelling/redness, etc. These photos/videos can be valuable in addition to your symptom journal.

I know it's hard waiting for an answer. Many of us have been there. Hang in there and know that you will have an answer soon. I hope that soon you find a dr who will be in your court (in addition to your PCP) and will start doing something for you as opposed to dismissing you. Let us know how you are doing.