On 20th nov I had sex with my bf (withdrawal before ejaculation)... on 21st morning my period came. Around 25th or 26th my period ended and then I had some brown discharge within 2 days after my period ended. It was smelly >_>

 

And I think since then or after that, I'm not so sure exactly when, but my vagina has been experiencing a little bit of pain. It's not very painful but each time the pain comes it last for only 1 or 1.5 seconds. The brown discharge only lasted for 1 or 2 days. But the pain still continued. I found out that smelly brown discharge is some sort of infection. But will an infection cause vaginal pain like what I'm experiencing? It's like a pulling sensation. I'm very worried... What's wrong with me? :( What's causing this  brown discharge after period?

 

Or is it because I'm stressed? This whole week, I haven't had sufficient sleep. Sometimes, 5 hours, sometimes 3 hours. I'm rushing my assignments... And I have also been experiencing gastric and indigestion since yesterday. It should be indigestion because of the different timing I sleep since I'm rushing my assignments, I haven't had proper timing of eating meals recently... My right abdomen hurts and my intestine hurts too. and to the left of my belly button also hurts. But today I feel much better.. So does it somehow link? Please help :(