Gastroenterology :: Constipated For Almost Two Years

So back in 2013 there was a time when I ate these fiber bars for breakfast everyday for about a week maybe. At the time I didn't know when you increase your fiber intake you need to increase your water intake. So I went maybe 2 weeks without using the bathroom at all. I guess I really didn't notice it because at the time I was dealing with the end of the year at school and family issues. When I finally did notice my mom and I went to see my doctor. She took an X ray of my stomach and just prescribed me miralax. Which for me didn't work. If I took too much I things would be watery but still nothing much would come out. If I took the right amount things would be pencil thin and still not much came out. Ever since then my digestion hasn't been right. Over the years its just gotten worse, i've tried many things on my own. I've tried the liquid magnesium citrate and that used to work well but it does nothing anymore, Fleet enemas do nothing, I've even tried a real enema and that too barely did anything! There were points where I didn't use the bathroom AT ALL for weeks and even months. When I lay flat on my stomach I can feel a huge lump, or when I press on my stomach its painful. Sometimes my stomach gets so bloated and I look like I'm pregnant. Recently I had this extreme sharp pain in my side I couldn't even move, I just curled over and waited for the pain to pass. I'm so afraid to eat, I've even feel like I have to throw up if I eat too much, and I have thrown up a couple times. I went to the doctor again recently and told her the miralax isn't working, I told her about the pain and the throwing up. She did another X ray and told me I was filled with stool and blocked up all around my colon. But all she did was tell me to either take dulcolax or take a square of ex lax followed by a fleet enema for a week! I would think if I'm at the point of throwing up something more would have been done!! (Btw she's a pediatric doctor,  I'm 19 but she said they would keep seeing me till im 21 if I like. I don't know if it's because she's a pediatric doctor is the reason why she's taking these approaches that aren't working.  Maybe she doesn't know what to do?) All she is doing is telling me to take different laxatives but it's not working, and I'm so scared.. I've read people can die from fecal impaction. I've read about people with the same problem as me but they have only been constipated for a month or less and they've been to the ER and had things taken care of! But I've been like this for almost two years so why haven't I! I don't think my doctor is taking this seriously and I'm thinking I should go to a 24 hour clinic and maybe they'll actually do something? Or the ER, but how would I get in? I'm just really scared and I don't want to be like this anymore.