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.