ISSUE WITH BP. Change all of sudden.

Sir, last week I had bit stiffness in my neck and bp around 155/95( used to be in range 135/85).. was feeling bit shaken to went emergency room.. their they did my ecg.. ecg attached.. and given ecosprin 300 mg, clopid and atorvas.. one to me. Post that kept me for three day and monitored my ECg every six hours... My ckmb was 14 & 11.. they said everything is ok and sent me home.. last year my angiography, TMT (@11.3) was done which was normal bcz of neck and chest stuffing left side.. which comes and go some time. Sir now I am monitoring my bp which is continuously coming below 105 and 75.. sir please guide.. why my bp same change all of sudden. And reason for neck stiffness.. thanks sir.. I am bit worry.