1. Your Thyroid was likely tested with a thyroid function test (vs. CBC). Though it is "normal", I would request values to see if it is borderline.
2. Anxiety/panic attack is not just psychological. Symptoms are generally physical and produce documented changes in vital signs and other test results. Your Doctor has a more complete picture, and may have multiple reasons to diagnose anxiety attack as a cause of your episode. Anxiety can be subconscious. Life experiences, stress, worries and fears may not be experienced, or may be minimized by people with strong will and determination. (Suppression causes AA as well.)
That aside:
Your milder symptoms individually can be attributed to factors like poor diet, sedentary lifestyle, food sensitivities, vitamin deficiency, diet and possibly hormaone imbalances, and possible chronic blood pressure elevation (not necessarily "hypertension, but a pattern of episodic elevation).
Taken together, then added to the episode recently dubbed an anxiety attack, they bear further testing.
The "episode" you describe could have been a seizure or other serious disorder, but only tests can differentiate and diagnose.
Lifestyle changes are important, stress reduction will help, diet and exercise + supplements may aid overall well being but:
You still have no diagnosis, making any plan for treatment too general. Lupus and RA are not the only possibilities. Secreting adenomas for example have a very similar symptom profile. Type 2 Diabetes, vascular disease, even cancer, while unlikely, should be ruled out.
There is a fine line between overeacting or being to aggressive in investigating symptoms and being too conservative.
Minimally: a repaeat Thyroid profile, CBC, clotting time, EBV and liver enzymes should be drawn. A CT of head and neck, with contrast and EKG are also indicated. Hormone testing may be indicated, depite young age. Other testing should be based on cummulative results.
It is possible your Doctor is not entirely aware of the effect your health is having on daily life, or he is minimizing or diregarding your complaints.. Checking for Autoimmune disorders indicates he is willing to look, but you may have to advocate for yourself: monitoring and organizing your own course of testing.
Keep a daily journal of physical feelings experienced (good and bad), diet, activity and detailed description of any further episodes you may experience along with questions to ask at next appt as they arise. Also write down Doctors names, addresses, tests, exact number results, and request copies of test results (CT, pathology, EKG results).
If you are unsatisfied with your Doctor's approach get a second opinion. This is your right and your resposibilty.
I really hope you feel better very soon. Can I add, or clarify any info?
I hope my answer is helpful. If you have more questions, just ask! I am happy to help. If not, please click "accept" so I may receive credit for my work.
Positive feedback and a bonus is appreciated when you feel I've earned it. Thank you, Christy