Hi there and welcome to the site.
I have had a couple hernias, I am not a doctor but it sounds like it is a hernia. Is there a clinic that you can go to, a place that will see you on a sliding fee or no cost fee based on your income to get a diagnosis?
You can look into social services most states (if you are from the USA) have clinics such as the one I mentioned above. If it is indeed a hernia please be aware of the complications from mesh used in hernia repairs.
The pain does get worse at night, at least it did for me.
What kidney problems are having?
If you'd like to pm me feel free to do so.