I had shingles a month ago on l arm. felt like someone stabbed my arm. now the same pain is on r arm but no sign of shingles. is this common?

Likely not shingles: While it is possible for a person to get shingles more than once, it is quite rare, especially in the wake of the first attack. Your antibody levels to herpes zoster (the virus that causes shingles) are high and should prevent another infection for at least a while. More likely some there is some other cause behind the pain.