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You have been diagnosed with Sinusitis
(inflammation of the sinuses
All of these symptoms can be easy attributed to sinusitis. Sinusitis at times can be difficult to treat at times.
Although your worry is genuine in the sense that a malignancy can have the symptoms of low grade fever
and sweating however it should also have other symptoms such as weight loss
, decrease in appetite and excessive fatigue
Still one should not go to that extent since there has been a diagnosis that is easily explaining your symptoms. If on the other hand there was no obvious cause for these symptoms only then one should think of investigating your symptoms on the lines for a malignancy.
So it would be best at present to stay calm and follow your treating doctor's advice and ultimately get better.
Getting anxious at this place in time would only disturb your life (both professional and social) and that of others (your loved ones) and would also not serve any purpose.
Hope This was Helpful