I had low vitamin D as well. I can tell you I felt much better once I started supplementing. What has your doctor prescribed for you? Typically they will put you on a high dose once a week for two months and then a daily over the counter dose. Your vitamin D level is pretty low and at that level it can make you feel crummy. So just addressing that issue may help you a lot.
I am no doctor, but I can see why your physician is not concerned about major health issues since all your bloodwork is so good. Your protein levels are good too so that doesn't point to kidney problems at least.
To be quite honest, it's very possible that getting your vitamin D levels up to normal will make you feel much better. I know it did for me
Let us know what the doctor suggested about that.
All the best!
