I was prescribed the same Oxybutynin 5 mg. tablet 3 times a day as needed for my possible bladder spasms. I didn't take many of them, but they really did help the first couple days, so the 3 or 4 day life of the patch seems normal. My pills would make me drowsy though, and I napped more than usual but you need to do that anyway.
No one has directly mentioned this lately, but I found it to be true: Get up and walk as often as possible, then get back in the recliner or whatever and rest. Short walks to start, several times a day, increasing in length as you are able. If you aren't walking, then you need to be down and resting. Naps morning and afternoon are good and will really hasten the healing and recovery. You are allowed to be really lazy for the first week or two. If possible, take the full 2 weeks to walk, rest and rest some more. Getting back onto your regular diet will give you a return to full strength tooo. I found I couldn't gain much on sick-bed food. LOL