I've felt so bad for while now, do you have any idea what it is?

(Not sure if this is the right place but, here it is.)

I'm a 17 year old female, and well, I've had these symptoms so far:

• Nasuea (Still going on.)
• Throwing up
• Lower stomach pain
• Excesssive tiredness (Still going on.)
• Dizzy (Here and there.)
• Weak (Here and there.)
• Back pain (Still going on.)
• Sore boobs (new symptom) (Still going on.)
• Just recently, lower left side/back pain. Severe when I move, can't lay on it at times.

Now I don't know if this matters but I had unprotected sex on September 29. My last period was around 2 weeks before that day. I was on birthcontrol but I wasn't taking it properly. About a week and half or so after that I had this weird bleeding, it was light, on and off, for about 3 days. I have headvy/longish periods. So this was weird. I've had pregnancy tests a week and a half ago - 2 weeks ago. Says negative.

But I've felt like this so much? What is going on..?

Any ideas, please.. just please.