I have had pt and a esi for a bulging disc l5-s1 why do i still hurt so bad? i've also had a emg and the doctor said my nerves are slow on left side

First, a bulging : Disc is a fairly normal finding. Pt & an esi are only parts of treatment. Treatment depends on correctly diagnosing the cause of pain. If your pain is primarily in your back, an esi is unlikely to help & if sciatic in nature, it works 50% of the time. Lifestyle factors play a role like smoking, being overweight and not exercising regularly. Medication, time, activity modification play a role.