I had mild Lower back pain (buttock) from last 7 years, but from last 2 months have pinning and needles sensations in legs, leg weakness, as per physician MRI done, report says mild compression left traversing l5 nerve root, told me to do exercise however from last one month I had same sensations, some time (stabbing kind, spasms)in back head and stress on back head. Please advice, back head irritation is due to lower back problem as report investigation.