As much as it'd be nice to shrug everything off into the land of "see a T", to me, something has got to explain honest physical pain and symptoms. Healthy bloodwork at least puts the mind at ease over what was looked for.

You mention only clinics and general practitioners, what about seeking out a specialist? Internal med, neurology, etc? What about a homeopathic doctor?

As a neurology patient, I've seen one too many limbo land types of stories, only to see follow up years later of a definitive diagnosis.

Keep pushing the topic to any and every provider that you can.