My 79 year old dad was prescribed Tramadol for back pain on April 5th. He began taking the recommended dose of 6 pills daily. Immediately his personality changed. He had no desire to do anything, he slept all day because he was unable to sleep at night. He also stopped eating. After 18 days he stopped the pills, but the sleeplessness and lack of interest remain. He ended up in the ER yesterday with chronic constipation due to these pills. He has been off the pills for 7 days as of today. How much longer will these symtoms last?