Hello~A lot of this does sound like fibromyalgia or neuropathy which is being made worse by stress. You said they did an MRI, so that would rule out MS as it would have shown white lesions on your brain.
I suggest possibly seeing a chiropractor, you may have some pinched nerves in your neck and upper back, if that is the case, you will have burning and twitching. He/she will take some x-rays, and discuss them with you. After a few adjustments, you should start to feel better.
Also wanted to add im 42 and have had something similar but no veins bulging but left arm chest and sometimes leg pain. On and off for atleast 20 years. First time i really noticed it was after i ate at my first buffet i way over ate and felt like i was dieing. They said looks like he way over ate...ive always thought it to be gerd. Or something used to get acid reflux alot and sometimes the left arm leg numbness and pain and it would last like 6 months... and the wierd thing that happens with it is yellow/pale stool?
Tried a 1/2 cup coffee at work about a hour ago made eye twitch stop...? But caused vein pain on left foot right above toes and rear of neck to hurt and little cold/hott feeling spots randomly everywhere lol... this is crazy
I used to drink lots of coffee and Soda about 2 months ago but have quite been testing the coffee about once every week or 2 to see if it makes it worse or better #imissmycoffee
Iliac Vein Compression (May-Thurner Syndrome) can cause Vericose veins in the legs usually Left Sided. Renal Vein Compression (Nutcracker Syndrome) causes congestion of all the veins around this area and can affect the arms, neck and jaw. These conditions can also cause anxiety, chest pain, shortness of breath, dizziness and just about every other problems imaginable. It’s very unlikely doctors even looked for these conditions as most have never heard of either.
Also seems to get worse at night and effect sinus at night. Also seems coffee(caffine) makes it worse..standing at work for long hours makes it worse also