Last night I had a bad bout of this symptom and had to take a diclofenac sodium tablet. I had a headache as well. I've always noticed over all the years of my ME (over 20 years) that I get a strong pulsating feeling going up the back of my neck when I have overdone it. It feels like the blood is being pumped faster. My blood pressure has been on the lower side of things for most of my ME. I think now it is more in a normal range. Anyone else get this symptoms. I may not be able to respond. Thanks for any reply.