I was recently scheduled for some surgery and when i went in for procedure my b/p was 195/126.  I have never had high blood pressure before.  I went to see my cardiologist who put me on b/p meds.   It seemed no one could tell me why my b/p had jumped so much.  I complained about feeling tired, confused, etc....Finally i asked general dr. to do thyroid test (which in February 2011 was fine).  Today she called to tell me my TSH was 94 - is that even possible and could that be what cause my b/p to soar?
Your TSH levels may need to be redone again along with T3 and T4 levels.  Apart from that, your high blood pressure could from many causes from as simple a reason as anxiety before surgery. So before knowing the cause of high BP, we should know details like your age, any other health issues like the cause for your surgery etc. As your cardiologist has already put you on antihypertensives, we better wait for 2-3 weeks to see their effect on your BP. You should get your BP measured weekly in the meantime. You may later discuss with your doctor regarding the causes of your Hypertension which in most adult cases is idiopathic(unknown cause or primary), dietary, physical activity and Chat Doctor.  Hope I clarified your concern regarding your high blood pressure. Do not hesitate to ask any further questions regarding your condition.