Thea K.

Hi.. as per yoga relaxing Asana, suksham Asana  and pyanayama practice should keep the BP normal.. but yes while practicing advance, complicated, inverted yoga poses it may rise.

You should do suksham vyayam, hast mudra asana followed by pranayama..you can do mandook Asana, ardh halasna, vajrasna, yogamudra, setubandh, padmasna, gomukh Asana, 

you should avoid kapalbhati and shatkarma as it put so much of pressure.Kindly avoid backward bending, jangha Shakti vikas, inverted Asana, avoid Asana lying on stomach.

Hi.. if you are a beginner then you should practice breathing practice with total awarenesses.. take a slow and deep inhale and slowly exhale repaet it 21 times and it will calm down everything in you.. always try to feel your breath.. try to feel every portion of your body where the air touch you (nostrils, nose, throat, expansion & contraction of lungs/stomach) while inhale and exhale.. slow and gradually a journey to your innerself will start.. stay aware for every inhale & exhale.. For this keep yourself at isolate & calm place with a light music so that it keeps you unaffected from external disturbance..