Having Stomach Pain, Headache And Taking Hiprex. Feels Like Bladder Infection. What Could It Be?

Hi I usually enjoy making love to my husband and most always have numerous orgasms which has only occurred in the last 5-6yrs, I think because we changed the position. But last night, I had severe stomach pain right up to might chest and this morning I woke up with a headache. I also, over the last week have been taking Hiprex, as I felt as though I was getting a bladder infection (urinal trac infection), which I have had twice before. I could fee the systems and received this over the counter at the chemist and started these tablets about 4-5 days ago. They have helped and has subdued the feeling of not being able to pee.