I think I had a yeast infection, and let it go too far untreated. Can it be treated with regular store remedies?

I had the yeast infection for the first time. I used Monistat 7 and i felt fine. Well the day after the last day of treatment, my fiance and I thought it was fine to have sex. So we did. The next morning i felt the symptoms of the infection. I bought the Monistat 1 just in case but can anyone answer why it came back or if im allergic to the lube on the condom?

My boyfriend has been taking an antibiotic for a while now and we recently found out that he has a yeast infection. He has been having testicular pain as well and we were wondering: Could that be from the yeast infection or should we be worried about something more serious?