Can stress or infection cause chronic diarrhea?

Hello doctor,

It has been about two to three weeks since I started having diarrhea. My defecation frequency has not changed and is most of the time at a specific time in the day (usually morning), and it is usually just once a day (at most twice), but it is generally watery diarrhea (sometimes the stool is firmer).

I have sometimes noticed an urgency to defecate while having stress. Actually, I get nervous sometimes going to my study.

Also, I have noticed having palpitations recently, but I did not have them before. When I measured my heart rate, it was about 94, which I think is a bit high. I get really tired some days because I am still not that used to going out for long hours, and also because my body is a bit frail, and I am considered a bit thin. I also have minor thalassemia.

There is also another possibility that I may have gotten an infectious disease in the hospital during the previous weeks. I recently also experienced a few small muscle twitches sometimes. I would really appreciate it if you would inform me of what the diagnosis is.

Please help.

Thank you.