Hello, It is possible you have the flu now that the weather is changing and having viral pleuritis that is worsening the asthma. If you are hyperventilating, or having a panic attack this will change the electrolytes in your blood and make your fingers and legs numb. However, a flu-like illness and legs numb could also mean you are having sensory neuropathy (nerve disturbance affecting sensation) and is a sign of an inflammation of the blood vessels and referred to as vasculitis. CBC, LFT, Urea creatinine, urine dipstick, CXR, autoantibody profile are mandatory tests if this diagnosis is considered and your doctor will be best placed (after a physical examination) to ensure whether or not the tests are required. Thanks.