Probiotics Issues

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Hello! I started taking probiotics last weekend in an attempt to make my digestive system work like a normal person's. It's been a little off my whole life. Within a day of taking them, I started feeling better. The next day, I started feeling sick if I ate. It continued to get worse throughout the week and I hardly ate for 3 days. I quit taking them Friday and I'm still feeling sick. I took a migraine pill for a migraine last night and became very ill all night. I'm still sick. I couldn't even finish a banana. So, I'm wondering, have any of you had any issues like this?