I suffer ongoing dizziness, headaches, light sensitivity, numbness & pins & needles in left arm/ shoulder, also chest pain both sides. Any suggestion?

Multifactorial. See neurologist to rule out fibromyalgia. See ENT to check your vestibular function. Your pcp can run lab tests to rule out exidental chronic poisoning or vitamins deficiency or cardiac arrhithmias. If after all of the above you are still sick consider major university for further work up. Good luck.