HI,
   I understand your concern.
 -  
Nuchal cord around neck is  a common finding in 
pregnancy.
    Many a times it can get rewound spontaneously & you may deliver normally.
     Even if persists/ forms a knot- LSCS is performed.
 -You are already taking medicines for 
high blood pressure. so do not worry about that. try to avoid psychological stress/ 
anxiety .  In addition,try to be positive & calmposed. This will help you in controlling blood pressure.
  * - Follow your doctor's advise strictly ,be regular in  pregnancy check ups.
    -Be alert about baby movements daily. You can count them for fixed hours at fixed time every day. In case you find any change ( less or more),you should see your doctor.
  * As already said, there are chances of spontaneous correction & normal delivery. At the most you may need LSCS- which is very easy with modern techniques/ materials. So please do not worry. A careful vigilance/ expert advise would take you out of the problem.
   Thanks.