Tramadol certainly can cause hallucinations. So can fentanyl.
Are you taking this combo for something OTHER than post operative pain?
If a person's pain levels fall, say as you heal up, a high dose of both of those drugs will spill over and cause considerable side effects. Add into the mix... prednisone which can affect the brain (psychosis in some people) and it is a powerful combination!
So I'd discuss with your doctor, perhaps some medication adjustments. If your pain levels are coming down, getting off fentanyl would be first I'd think.
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Weezie looking at petunias 8.25.2017
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