Wow...that's a lot of diagnoses to swallow in one blow. :(
**I am not a doctor, I'm an RN, so all I can tell you is that there are questions to ask about your diagnoses, and offer some tips about how to be comfortable** Emphysema & fibrillations can definitely feed anxiety. If you're short of breath and/or you've got a fluttering feeling in your chest, those will make pretty much anyone anxious. Presumably this is based on your EKG...did they say your bradycardia was related to a block of any kind? Lots of people in their 20s and 30s (and even older) have asymptomatic, benign bradycardia, which might not be too much of a concern as long as your heart does respond appropriately to increased demand (i.e. can you go up 3 flights of stairs without getting outrageously out of breath? Obviously the emphysema can have an effect on that...). Those would be some questions for your cardiologist.
Fibrillations...again, depending on the EKG and your lab work- could be electrolytes out of balance, which is not hard to fix (but important to do so). If you're going in and out of atrial fibrillation (paroxysmal atrial fibrillation), that's another story altogether. And the dilated aortic root...well, there's a range for that, the low end of which is asymptomatic, and certainly a host of causes. Hopefully they're hooking you up with a cardiologist and a perinatologist to help you sort out what's what here. Bring a notebook to every single appointment and have it any time you talk to a doc on the phone or are getting lab results back.
A few tips for dealing with shortness of breath related to COPD (emphysema): use pursed-lip breathing for exhalations when you're feeling very short of breath. This will help you control your breathing for a long exhalation (good for blowing of CO2) as well as provide a bit of back-pressure to help open your alveoli. Sit up good and tall when you do this. If you're feeling anxious, try "square breathing": imagine a line drawing a square around your abdomen, breathe each line of the square for 3 seconds: 3 seconds to inhale, 3 to exhale (or better yet, make it 4), 3 to inhale, 3-4 to exhale, and you're back at the start of the square. If you breathe the square 3-4 times, you can often calm the anxiety. And finally, avoid all secondhand smoke, known allergens, fumes, etc.
Good luck w/ all this. Take care of yourself, and definitely cut back on stress right now wherever you can- Xmas and all that should be on the back burner this year. No handmade gifts, no Xmas cards, no baking- no Martha Stewart! <3 Do only the essentials and take time to rest as much as possible.