A normal chest X-ray, HRCT and autoimmune panel, but a raised ESR and positive
CRP, means there's some ongoing inflammation that hasn't been pinned down yet, even though the common causes have been ruled out. A PET-CT is a significant scan usually reserved for specific situations, so it isn't something to decide without a specialist reviewing your full case first.
Next Steps
Please see a rheumatologist or physician, who can review your reports together and decide whether a PET-CT or a different, more targeted test fits your case better. Carry all your reports to that visit.
Health Tips
Symptoms lasting 8 to 10 years need proper follow-through, so please don't let this go untreated further.