Good morning Dude!
Many of the members here go through what you are describing, and seems to come with the turf as we take the pain med's. I cannot tell you how many haircuts I have missed over the last 3yrs or so. and one of the barbers got so fed up with it, she booted me. I finally found one that is sympathetic to my memory loss because of the pain med's. Of course, it may have helped that I photographed all of her children's sports photos for several years.
One thing that I do is to keep a daily written log of what needs to be done, and some of the reminders go on my phone and or computer. It is frustrating to forget things, so I understand how you feel. Make it a habit to write down improtant items that need your attention, and you might also have a family members help you with this by calling you to remind you of appointments.
I even have a friend at work who has offered to call me and remind me of things, as he understands the memory loss I suffer from.
Hope some of this helps,
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"Snowflakes are one of nature's most fragile things, but just look at what they can do when they stick together"