I think I had an anxiety attack in my sleep-

So just from my experience, the whole college and family thing will likely just compound something that's already an issue. Most people I've known and have talked to have a main anxiety symptom that is worse than the rest. Some people its breathing, some its a dizzy thing, some its tingling or feeling like choking, or throwing up or whatever. Mine has for as long as I can remember manifested in a feeling like I'm gonna puke. Further to this, I've always had a sensitive stomach, so I get sick and puke easily. Its a chicken or the egg situation. 
Anyways, part of my way of dealing with my anxiety for years and years, was that if I was gonna go somewhere that caused me anxiety, I just wouldn't eat. Nothing in my stomach nothing to throw up, right? So it kind of worked for a while, but of course spending a lot of time not eating comes with other issues lol. I love food, but I don't like eating a whole bunch, cause my stomach, and my gag reflex, and my sensitivity to food texture are all just assholes. At the best of times, where I'm generally chill, and my anxiety isn't giving me much hassle, I can tolerate these things, relatively easily.
As I get more stressed with life stuff, and it begins to feed into a state of general anxiousness, eating becomes harder and harder for me. I begin having to choke meals down, just to get food in me. For my brothers wedding where I was best man, I spent pretty much the whole month coming up to the wedding struggling to eat, because I was so stressed, and anxious just all the time. 


So just based on what I'm hearing, I'd guess its a similar thing. Eating is probably never your favourite thing, but in a more balanced place mentally you tolerate/deal and its all "good". But the more everything else begins to get to you, its just gonna compound a problem that's already there. 
Anxiety is like this perfect evil genius, that knows absolutely everything about you. It finds your weaknesses and it goes after them, as it knows that's where you are most likely to cave in. 
So the chewing/swallowing thing is absolutely an issue, I don't wanna downplay that, but my guess, is the overall stress is the root of why the chewing/swallowing thing is getting so much worse.

I don't really have any good advice for you, other than the basic shit like take time to breath, make some time to do so stuff you enjoy doing to help you relax, try some exercise, meditation, all the shit I'm sure you've already heard.. Mostly just try to go easy on yourself. This kinda shit is hard. 
Have you ever gone to a doctor to talk about this stuff, or get any of it checked out? (I don't know what the healthcare system is like in brazil.)