Thank you for writing.
I'm sorry you are going through this kind of pain and discomfort. We cannot say why this is going on, especially as all your tests are not giving you answers.
Since you have four other family members who also got UTI's, it's possible that there is an e-coli infection going on and possibly being passed on. Generally, tight pajamas or a hot bath would not cause this unless somehow there was e-coli in your water supply.
Have there been reports of contaminated water in your area? Is there trash filling up your street?
We look forward to hearing back from you-