Bit late to reply, but people might be looking for this information.
What you are experiencing is called
sighing dyspnea and is usually exacerbated by amphetamines. Sure it won't hurt to see a doctor, but what you are describing is very very specific to this syndrome and I am convinced enough to take the risk of telling you there is nothing to worry about on the somatic side of things. This is not medical advice, but most medical advice I got wasn't worth shit and this sure the fuck is more hard information than you could squeeze out of most doctors:
Firstly you should try running to (almost positively) rule out cardiovasular/pulmonary issues. See if running...
a) triggers your symptoms when sober or...
b) exacerbates them when you're on speed.
If so, go see a doctor. If not, then here is the good news:
1) Your symptoms pose no imminent threat to your health.
2) If things gets worse, it will surely keep you from doing speed, since this yawning desire (which may not sound like much of an issue to most people) can be become quiet anguishing.
Many patients experience these symptoms 24/7. There's no easy way to get rid of it for them. You on the other hand got it all laid out for you.
Of course you could instead of not doing stimulants try stacking GABAergics. Benzos, barbs, G or booze. Pot can be very very helpful if you are not prone to become anxious under it's influence.
Opiates can help some people. Others will see no benefit. I couldn't tell you how you're gonna react. It shouldn't be as effective as the other drugs listed and will probably rebound even harder than the others.
Many will get these issues when withdrawing opiates. Naloxone can trigger them in opiate naive people.
Your oxygen saturation may indeed be lower than usual when your symptoms occur. Ask your friends if they could watch your breathing (or get an app for that if there is one

).
They may tell you that after you take those very deep breathes while getting angry for not getting past that yawning turn-around point, your breathing actually becomes more shallow.
In consequence your oxygen levels will diminish until you get the desire to yawn/sigh/breathe until you feel your stomach will burst any second.
It's the up and down that is distressing you and it may take quite some time until those levels actually stabilize which is part of why breathing exercises won't bring
immediate relief, but it will after a while, just like running for an extended period of time. Try both.
It's generally a bad idea to combat side effects of one recreational drug with another. This class of drugs (stimulants) is just not made for you. Maybe that's a good thing. Not sure if it will cheer you up: Some people get every single of the worst side effects listed in the books for every drug single recreational drug available. For you it's just speed. That shit will only make you less likeable in the long run anyway.
So your options in short:
- Breathing exercises/physical therapy
- Psychotherapy for what may be occult anxiety issues
- Whenever you do speed, keep enough booze, benzos and pot around for you not to run out mid-session
First line treatment would imho be to
do acid instead though and sort through those issues in your life. Get your shit together and stop doing fucking speed. Drugs are supposed to
enrichen your life, not make it even harder than it already is!
Another thing I forgot to mention is that hypertension of the pulmonary artery - while a very rare disease - can be caused by stimulant abuse. Amphetamine is not known for this, but - and this is one of the many reasons why taking rc's is so risky - other stimulants your speed might be cut with are not only known to fuck up that intimidatingly big artery, but may in fact very well be responsible for half the cases out there. The other half of patients is probably just lying to their doctor about abusing stimulants.

However before anyone gets even more anxious than they already are: Pulmonary arterial hypertension may not be curable, but it can be managed very well these days and people to grow very old with it.
Plus, which is why I recommended running earlier: Pulmonary arterial hypertension will always be exacerbated by increased oxygen demand.
If you came here due to experiencing breathing issues not unlike the OP's issues and only read these last lines, please do read the rest too, since these last ones could be misleading. The OP most likely just has functional, not organic issues underneith that yawning desire.
Much
