Is this all related to a kidney infection?

First off, I am way sorry you are going through all of this. My guess is it could be that you are ping a kidney stone. It may also be that you have a UTI in your bladder. I would keep checking your urine for any blood ( any pink. red or orange coloring) also look to see if there is weird particals coming out. I would schedule a doctors appointment asap and have them run your urine and blood one more time just to be safe. Use hot and cold packs on your lower back and your bladder. Switch off ever half hour, trust me it will help. Also try and take a warm bath. If you have a fever definitely go to the ER. I have had over 100 UTI's and they found out that it wasn't my kidneys, it was my bladder and ended up totally reconstructing it. If you keep getting UTI's you might want to go see a urologist and see whats causing then and the sivere pain. I hope this helps!!