It is a mystery to me. Could you be having these things going on more regularly and the only time you notice them is when you are relaxed?
Alex
It probably is the tapezoid muscle if the knot is in the upper back hmmm the eye pain may seem odd but here's an interesting tip bit of information...
"Once the upper trapezius trigger point is involved, the anterior trigger point usually not far behind. This trigger point refers pain to the side of the neck, jaw, and face, but it is notorious for producing a throbbing headache in the temple region. This headache pain may also be described as “behind the eye.” " http://www.triggerpointtherapist.com/blog/trapezius-trigger-points/trapezius-trigger-points-everybody-has-one/
i'm home today resting yet another reno repetition issue so i've had time to look around and what i've come up with is a chicken vs egg scenario in regards to trigger points (myofascial) and upper back spasms.
The trapezius muscle is one of the more commonly torn, stretched, strained or sprained muscle in the back and it doesn't necessarily take much eg minor-major falls, lifting a heavy object or repeatedly lifting heavy objects, twisting or a sudden movement, sitting posture etc etc can strain or irritate the trapezius muscle.
A Spasm is the initial reaction and it can be anything from feeling the muscle tighten to being heads up very painful but after a few weeks of it, the spasm can turn into a muscle knot, which is basically because the muscle is continually turned on and not the normal on and off cycle....and here's where the chick and egg thing comes in, if you have a knot that its self can cause the muscle to spasm if over worked, you move in just the right way to trigger it, sit wrong etc..
"There are three main parts to the muscle: the Upper, middle, and lower trapezius, and each part has its own actions and common symptoms.
Common Symptoms
headaches on the temples / "tension" headaches
facial, temple, or jaw pain
pain behind the eye
dizziness or vertigo (in conjunction with the sternocleidomastoid muscle)
severe neck pain
a stiff neck
limited range-of-motion
intolerance to weight on your shoulders
Middle Trapezius
mid-back pain 1
headaches at the base of your skull 2
TrP5 refers superficial burning pain close to the spine
TrP6 refers aching pain to the top of the shoulder near the joint 3
Lower trapezius
mid-back, neck, and/or upper shoulder region pain 4
possibly referral on the back of the shoulder blade, down the inside of the arm, and into the ring and little fingers (TrP7), very similar to a serratus posterior superior referral pattern
headaches at the base of the skull 5
TrP3 can refer a deep ache and diffuse tenderness over the top of the shoulder 6"
http://triggerpointrelief.com/cdrom/trapezius.html
It's been an interesting day reading up on this again but i don't think i've come up with much that will really help, maybe something there to follow.....JJ
Have you had your potassium and magnesium checked?
I'd forget about 'health anxiety' for the moment....it's not outside the norm to have a spasm in your back that triggers spasms in your legs and whilst it may seem really weird, pain/discomfort around the eye can be associated with even some minor spinal issues.
It might be possibly that the prolonged positioning or the type of support of your body whilst watching the movie and after the days activities was enough to irritate the muscle, tendons or ligaments in your spine and cause the chain reaction. If your back spasms constantly for weeks or if the spasm comes and goes in the same place, you may have an underlying problem in your spine eg facet joint osteoarthritis, degenerative disc disease, spinal stenosis, herniated disc etc keep in mind that your muscle will instinctively react to any pain and inflammation in your back by spasm-ing.
The nerves that go to your hand come from your spine (the neck) and they travel down the arm into the fingers, spinal issues or a twist of the ligaments can cause pressure on the nerves and you can get transient sensory feelings like tingling, numbness or zaps in the middle fingers. It maybe coincidence but doubtful, that your finger tip is feeling odd the morning after the spasms, 'IF' there's an underlying spinal issue that shows up with body positioning, then your sleep positioning and neck support will be a factor too...
Hope that helps........JJ