What could it mean if I woke up this am with a painfully full bladder and after urinating the pressure has stayed all day?

Get evaluated. It can be very difficult to tell without a workup whether you are experiencing problems with voiding (expelling urine), or having problems with a lingering sensation of bladder fullness. First see your primary care physician to rule out any obvious issue with urination. If any more subtle problems with voiding are found, a urologist will be able to make sense of your symptoms and offer relief.