[cperciva]

[Blood pressure is] around >170sys/120dia and higher for me when feeling good)

Please ask your GP to refer to you an endocrinologist. This level of elevated blood pressure is directly harmful in the long term; and while I am not a medical doctor, I'm aware of potentially life-threatening endocrine conditions which can both (a) cause elevated blood pressure and (b) make you feel like crap when your blood pressure is not so high. Even if you're not worried about the long-term organ damage you'll suffer, I hope you'll take the risk of imminent collapse seriously.