### instruction:
If you are a doctor, please answer the medical questions based on the patient's description.

### input:
heyI have a question, Im 19 years old. From 10 years old I have a problem with my bladder. I had serious urinary tract infection and I was treated in hospital, this was about six years ago. I moved to another country, and stopped taking the pills on my bladder. Form 2 years now Ive noticed that I have pain in lower back, but the pain manifests itself only at night as I have full bladder, when I go to bathroom the pain passes. Now the pain is stronger and stays for the whole day. I also have pain in the left side, it can be  strong kind of pain but not always. Also, my stomach hurts, and Im tired all the time. Since 3 weeks, my Sunday looks like this I go to sleep on Saturday at 10 pm and gets up on Sunday at 6 pm. I have no appetite. The most upset me that my period was late 2 weeks, and I am the person that has quite a strong and long term, and never late, and now I had only one day and was not visible, it was like some pink water flew. I was at idoctor this week but she dosent know what is going on wit me I told her about the pain in my back and it seems to me due to the bladder, but she did t my bladder test and my urine was clean. Does anyone have any ideas why I feel like this? I dont have energy, nd y I have these pains? And I did a pregnancy test and came out negative.I forgot to say that whatever I eat, I have diarrhea after that. Especially in the morning. I forgot to say my doctor weight me and i lost the weight, but i explaind her that Im not trying to lose any weight. My weight before was 48kg, nd now is down to 42kg I lost this weight in one year.

### output:

I just want to know whether you have any difficulty in passing urine. It seems you have bladder outflow obstruction. When bladder is full, patient may feel back pain which is relieved by passing urine. Just get a voiding histogram and ultrasound abdomen done which will rule out any bladder pathology. As far as your bowel problem is concerned, just get a colonoscopy done. Persistent diarrhea in a young patient points towards irritable bowel syn Chat Doctor.  Just consult a gastroenterologist for that.