Why do I feel like I have throw up in my throat.

Several thoughts come to mind.  First, if you're having difficulty swallowing food, you might have some issues w/your esophagus.  Perhaps the muscles aren't working properly in coordination (which we call peristalsis)?  Perhaps you've got something in the way?  Or perhaps your esophagus is in (nutcracker) spasm?  

Sometimes bad heartburn (gastroesophageal reflux) can lead to bad nasty taste in the back of your mouth.  That's because your lower esophageal sphincter isn't closing down as tightly as it should, therefore allowing stomach contents to wash back up.  Over-the-counter antacids like Tums or Rolaids are a good first line attempt followed by Pepcid or Zantac (these are H2 blockers) and finally Prilosec (which is a proton pump inhibitor).  

If you don't get better shortly, better go see your family physician.  Sooner if you notice unexplained weight loss, pain, fever/sweats/chills, progressive worsening, bloody or coffee-grind vomitus, etc.  You know the drill.

Good luck! 

Its like when I feel the throw up in the back of my throat that's when I have a hard time getting my food down. I don't know if it has anything to do with me throwing up a couple of weeks ago due to anxiety. I lost five LB in a week. Like maybe my throat feels like it has to throw up or something or that I messed up my gag reflecx.