Bad Pain Through Right Leg, On Strong Pain Medicines After Back Surgeries, Cutting Down Roxicodone. Nerve Pinching ?

I've had 2 back surgery's and suffer on a daily basis. I'm under the care of a pain management which I see every other month. The last week I have started suffering really bad pain through my right leg. The strong pain meds I use are not touching this pain. I was just perscribed a new med called Gabapentin, perscribed to take 3 daily. Normally, I would have an epidural, but they are quite expensive and I've not made my deductible this year. Do you suggest I bite the bullet and get the epidural. In the last 2 months, I have gone from 6 Roxicodone down to 4 daily this month. I wanted to cut down on my meds and my Doctor was quite pleased. I have done great with the way, they slowly cut back on the pills, no withdraws and felt pretty ok. This new leg pain, is it because I cut down on my pills or is this simply a nerve being pinched ? I got an x-ray last month, nothing had changed much. 6 bolts and screws (1st surgery) and a casting around the screws (2nd surgery). Any thoughts or remarks are appreciated. I'm 59 years old and weigh about 120. Thank you.