I Just Got Switch From Oxycodone To Xtampza ER. At

i just got switch from Oxycodone to Xtampza ER. At first from what my doctor told me I was happy about the possibilities of not having to carry pain meds with me during the day, having all day control ect... but now I have it and it barely takes the edge off from the back surgeries and auto immune arthritis problems. I also have this eye condition due to a long time auto immune flare up they are not sure but the eye is always red swollen burns waters and the pressure can be at times unbearable. This new med Xtampza does not seem to touch this pain where the Oxycodone I was on did. Is this normal for this drug??