Hello, I have had a unilateral headache for the past 4 months now, my MRI was normal, showing only a straight neck, and I was advised to do physiotherapy. I have been doing for the past 3 months, but it isn t really doing any good. I take Celebrex 100 and Myogesic for the headache twice a day. The thing is that now I also have high BP readings with diastolic ranging between 90-103. My question is, can severe muscle spasm cause high BP? Thanks.