This isn't good. Whatever is going on is not normal. I have never heard of someone having diarrhea from tren or test. I wonder if its the gear or if you have added something to your diet that isn't agreeing with you. Sometimes guys will start to ramp p food or drastically change their diet to give 100% while on cycle. If this is the case, look at what foods you are eating. It could be one of these foods. Even if its something you normally eat  with no problems,if you have drastically increased this food, it could be an issue. If none of this is ringing a bell, I would stop the cycle and go into your dr to get labs done and make sure that nothing is wrong. I have a feeling this is more likely food related though. I have heard of stomach acid increase on gear and tren specifically, but diarrhea tells me its probably something in your nutrition. Feel free to follow up and share what you figure out