Can Discontinuing Tramadol Cause Seizures?

Question : Hello. I am needing advice About a recent change in medication. I just spent 2 wks with severe withdrawal symptoms from weining off Sertralene 100mg which was treating major depression as well as a PTSD situation. In replace I am taking Lexapro 20mg which I take in the am. Iam also recently on Trazadone 75mg for sleeping, tramadol 50mg tab 1-2 tabs every 4 to 6 hrs to treat a chronic back pain issue. I have been On this tramadol medication for no less then 3yrs. My Dr decided yesterday to remove the tramadol and replace it with a NSAID called Ketoprophen. Last night was horrible not taking the tramadol (part of my PTSD issue is from long term pain endurance) It is a tourturous situation the pain had caused and causes not only physically but emotionally as well. I am extremely concerned about the sudden stop of this medication Tramadol. The Dr reason to stop the Tramadol was concern for seizures but I just dont understand if the risk for seisures is so great that it would be unsafe to properly weine off the Tramadol first before putting me on this anti-inflamatory... pls help me understand better. The Change in a new care provider came with a recent move of State as well, i am currently visiting family for the next 3 wks out of state so have had to consult through nurses over the phone.
Thank u so much for your time in hearing my concerns and helping me understand my options better.
Melissa