having breathing troubles. diagnosed with a stomach ulcer.

Hi i am 18 yrs old. I started having minor chest pain so i got a heart scan. perfectly normal. Then all the sudden i started to have  shortness of breath, like i couldnt get a full fullfilling breath unless i really tried. i keep thinking about it and its driving me crazy(im also pretty sure i have anxiety. although i have never been officially diagnosed with it)Since i have panic attacks often. The shortness of breath started after i smoked TONS of weed one day. its been going on ever since, about 1 month. So i got a pulminary function test where u blow into the tube. and it came out perfectly normal. Then I had an upper GI xray done and it found a stomach ulcer(not a horrible one just a small one. So obviously i have GERD i can pretty much feel the acid. i have not been treated at all for it though. So can someone please re assure me that this shortness of breath is just GERD. it can get pretty bad if i start panicking insanely bad. to the point where i feel extremely lightheaded. I had anxiety attacks before these GERD symptoms or shortness of breath though. Its kinda weird though i shouldnt have anxiety, i am not stressed out over anything i have a great life i love everything and everyone in it. i am always doing fun things. im not depresssed. im a physically tough person(i was always the big jock in high school). so its so weird to think i have a freaking anxiety disorder. it must be something else. maybe something is just triggering minor anxiety i dont know. But has anyone ever had Breathing problems with their GERD? if theres enough acid to cause an ulcer shouldnt there be enough to make it hard to breath? I also have never been diagnosed with asthma or any serious condition for that matter. my dad would have noticed something serious after all these 18 years since hes a pulminary physician. i have no wheezing or asthma symptoms. i do not wanna go to my dad and say im insanely anxious i always feel like i cant breath. lol hopefully this is just GERD and not: 1.a serious condition like anemia or a lung condition 2. just severe anxiety cause emotiional distress is really stupid. Sorry this was so long i just really need some advice i cant stop thinking about me not getting enough air from my breaths. its actually pissing me off cause im used to feeling normal. never stress or depression. so any help would be greatly appreciated. damn that was long im so sorry.