I am one week away from a 40k state time trial that i have trained for a year for,but after a year of going to doctors for sleep disorder and being tired most of the time i was told i might have Marfans,This could be bad because of how it affects your heart,had echo,looked fine,missed some training because of house project and daily rain,went to get a stress test last week,but my blood pressure was to low to even give me the test,Heart problems run in family,dad had low BP,I am 44 with a max 213 HR and can TT at upper170s to low180s last week cant seem to get HR to go to 160s Not overtrained not dehyrated.Being a TT is nothing but a drag race where you need your Max HR should i even go?