The symptoms you describe are consistent with the diagnosis of sarcoidosis. One questionable exception is your "coughing up blood clots"; this has been described with sarcoidosis, in instances where there was either associated inflammation of lung blood vessels, called vasculitis, or associated infection, such as a fungal infection, in one or more of the bronchial tubes. Given the rarity of bloody sputum with sarcoidosis, your pulmonologist might want to consider examination of your lungs with an instrument called a fiberoptic bronchoscope; it allows for direct visualization of the inside of the lungs.
The diagnosis can be made clinically in some instances, but in those circumstances where the disease extends beyond the lymph nodes in the lungs, a biopsy is indicated.
The defining pathologic feature of sarcoidosis is called, "non-caseating granulomas." Most commonly these granulomas are found in the lymph nodes of people with sarcoidosis but they can appear in any organ in the body. The microscopic appearance of these granulomas is not specific to the diagnosis of sarcoidosis. They are also seen with a disease called berylliosis, caused by exposure usually in the workplace, to a rare metal called beryllium and the clinical presentation of this disease can mimic that of sarcoidosis. It is estimated that hundreds of thousands of Americans have been exposed to this metal, many of them sensitized and large numbers with the disease. And, other diseases can mimic sarcoidosis, including tuberculosis. You should ask your lung specialist if the possibility of diseases other than sarcoidosis has been ruled-out.
Your symptoms suggest that you could have multi-organ involvement with the disease. When lung function is compromised or vital organs, such as the heart or eyes, are involved with the disease, treatment with steroids is strongly recommended. The risk of side-effects from steroids must carefully be weighed against the possibility of permanent damage to your lungs or other organs.
Good luck.