Hi, I Have Had Heartburn And Sometimes A Pain In

Hi, I have had Heartburn and sometimes a pain in my upper back a lot of gas and burping was taking Protonix for about 7 years and was just changed to Nexium I have Acid Reflux disease and other stomach issue just started the Nexium last night and was able to sleep the night before could not sleep all night because of the burning in my throat and the acid reflux. Do you believe this is due to the Protonix not working?