Your description does no really bring and specific medical condition to mind, notably not 'spider bite' lol. If you have concerns see your GP.
I would be delighted to see the details of the award that was given to you for being in shape,whilst at the same time being 30lbs overweight
. Though I accept there is much debate as to whether obesity is an isolated risk factor or not, it still seems unusual and perhaps falsely reassuring to you.