@Garret
That's great that you are just wobbly on the romberg test. That is a good pass and you don't need to worry about MS, (as far as I know obv, I'm just a mum, not a GP).
If you are taking 28 breaths per minute, then that really really sounds like a bad attack of acute hyperventilation. Ideally, if you are nice and calm, you would be breathing at a rate of 12 breaths per minute. It's really great that you have identified that, because acute hyperventilation is something that you can treat yourself at home. Nice work!
In hyperventilation, the person is breathing with their chest rather than their diaphragm, and that makes the concentration of gasses in the blood go all wrong . It makes the person feel rubbish, and triggers more panic and more hyperventilation.
One thing that I find really helps when I am struggling badly with hyperventilation is this: I breathe right out as far as I can, and tie the belt from my bathrobe tight round my rib cage, just below my bust, like a corset. That means that I then have to breathe with my diaphragm instead of my chest and it pretty much instantly stops the hyperventilation within minutes. You could try that and see if it helps. You can also listen to relaxing music like this:
and if you do something with your hands, like folding washing or whatever, then that will help your mind to calm down. There are a ton of things you can do to calm hyperventilation and it is good to google those.
If you have a long term problem with chornic hyperventilation, then I have found it really helps to have an Oura ring like this: https://ouraring.com/
because it measures my rate of breathing and my stress levels and tells me when I am stressing too much and need to relax. It is very encouraging and has helped me a lot.
You can also go to see a clinical psychologist to talk about what is stressing you and that will help a lot. I do that, and it really helps so much.
The other symptoms that you are describing (other than the breathing) sound really really like a bad flu virus. Do you have a high temperature at all? Viruses can be really weird, but if it came on fast like that, then it's very very likely that if you rest and drink plenty and keep nice and warm, then it will just go away. It might take three weeks or whatever, but it should just quietly buzz off.
Does that help any?
I'm sorry that you are having such a hard time. I think it's likely that your GP is planning to wait three weeks and see if the "virus" just goes away.
I'm just a Mum and trying to help over chat here, so if I'm talking total rubbish, please do ignore me. I only have a very patchy picture of what your symptoms are so I don't know for certain what it is.