I need some help to find the answers to my question
Go to a doctor, they will be able to rule out a list of causes/diseases. You may have IBS-D. Psyllium may work in that case. But see a doctor first.
Could also be a parasite. You need to see a doctor though.
Could also be lactose intolerance. Again, if you've gone 2 years with this you need to see a doctor. Go from there, feel free to get back to us.