What Causes Neck Pain?

I'm 33 with 3 kiddos. I'm having pain in the veins on both sides of my neck... during and after stressful episodes with my young boys (ages 4 & 5...in the process of having my 4 yr. old screened for possible form of autism). Even when it seems I'm calm, cool and collected and handling situations well, I'm feeling the affects on my body and they are undeniable. Seems silly, obviously it's stressful raising little ones but I'm quite concerned about what exactly is going on with my body in the meantime. I've experienced muscle pain in my neck before from stress but this lingering discomfort in the veins along with other random tinges of pain in my body is something new. Should I check into this further?