Blurry vision

32 Male So I noticed around mid January that I as having some vision issues but nothing major, however now the issues have gotten pretty bad especially driving at night. At first I had no clue what could have happened but after thinking more I started taking Phentermine around the same time at 37.5mg. I saw that Phentermine can cause blurry vision so starting tomorrow I will stop taking that in hopes that it is the cause. Assuming that is the cause how long would it take for my vision to start to return back to normal? Would it be pretty much immediate or will it take longer? My biggest concern is I commute 50 miles to work and work a rotating 24/7 on call and I noticed tonight going to call just how bad my night vision has gotten, I could barely read speed limit signs on the highway and even then it was once I was close.