Am diagnosed with MS having 2 lesions on spine causing electric shock symptoms up spine into head, could I safely take hypericum to dampen pain.?

Why consider this? Hypericum is a homeopathic remedy for anxiety and depression, and would have absolutely no effect on a Lhermitte's phenomenon, which you describe. You would likely find better benefits from gabapentin, Lyrica, Cymbalta, Gralise, or Horizant, all prescription meds which your doctor could provide. Also, make certain that you are taking a potent MS medication, such as one of the orals, or Tysabri (natalizumab).
St. John's Wort is . An MAO inhibitor used by some for depression, although the designs of studies that showed its efficacy are in question. It has many harmful food & drug interactions, including causing high blood pressure. Please ask your physician & your pharmacist before using it. Be sure to tell them every other herb & medication you take, as well as as your consumption of red wine, aged cheese & licorice.
Discuss with doctor. These symptoms require a thorough evaluation to find out what's going on and what can be done for you.