Painful Periods

For the last year my periods have been worse than ever. I always had painful periods that included severe cramps and back pain. However, now they get so bad that I almost faint with the amount of pain my cramps and back pain cause. It becomes so painful that I actually end up vomiting and can not move from the fetal position for at least an hour or so. My period is always on a different schedule, onemonth being 35 days and another being 45-75 days. As you can tell that doesn't give me much of an idea of when I will get it as to prepare my body for the wrath it will feel once those cramps hit me like a ton of bricks! I do have special medications from my doctor to help with the pain and nausea once they kick in which sometimes is not quick enough, however just wanted to see if anyone else has gone through something similar to this and if they have any advice?