Hi Sararms,
Sorry to hear your news. Unfortunately, nobody can tell you when enough is enough, that is a choice you have to make. At any age there are no guarantees with IVF. It may not feel like it now, but the pain eases with time. Does your IVF clinic offer counselling? Even if you dont think you need your head shrunk, talking to someone does help. Make an appointment to see your IVF Dr and talk over what happened and the options for next time. Then make your decision whether you're up for it.
Hope that helps,