 [ Symptoms ] could i have had a miscarriage  i had extreme lower back pain and stomach pain for a week yesterday morning i had brown spotting then nothing until last night when i had extreme pain in my lower back and stomach then a weird looking blood clot came out and i still had extreme pain after there is a chance i could have been pregnant i had a weird feeling for bout a week really tired [ Disease ] b12 does have some beneficial effect with shingles but it will not cure or make the infection any less severe there are other anti viral medications that are more helpful but you can certainly add b12 if you want