I don't think bipolar has physical symptoms like that at least. I would consult my doctor. It CAN have a lack of energy when depressed or in a mixed state but I don't know if that extends to the problem you're having.
mine is more like muscles not healing after a few days of workingout. I am not as young as I used to be but still it should not as long as it does to recover.
Things like diabetes can cause wounds to have trouble healing.