please see a doctor!!
No doctor will diagnose a patient without taking a history and doing a clinical examination and then doing tests as appropriate. Clearly people can give opinions on this forum about things like flu jabs or ECG findings but as yet no computer will take over medicine for the above reasons. Being 3 Stone overweight is clearly not a good life-style choice for anyone but no doctor or pilot can diagnose you without all of the above in the same way that you would not fly a plane without doing pre-flight checks!!! May be no major problem at all but PLEASE make sure and see a doctor.