Gabapentin 300 Mg Cap. I Was Afraid To Tie This

Gabapentin 300 mg cap. I was afraid to tie this because of the side effects. My dr. Neurologist encouraged me to take it to help with my back and hip pain. I did not take it because I was afraid to take it. My primary dr said to take to also. I started with one for 5 days. I am moving up to 2 a day. Now I am getting an upset stomach all day. I have unbearable pain and ai am willing to try anything. I do not know what to do.