Our expert says:
I think a few basic blood tests need to be done: thyroid function tests, follow up full blood count and HB, ESR. Costochondritis is inflammation of the cartilage, which is usually not visible on x/ray or sonar. You may also have a gastritis (inflammation of the stomach lining) - maybe due to anti-inflammatory tablets used for the costochondritis. I don't think your doctor will think that you are a hypochondriac and I think they have to try and find the cause of the fatigue.
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