
What Causes Dizziness, Difficulty Breathing And Chills?

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Detailed Answer:
I read your question carefully and I understand your concern.
Carbon monoxide poisoning could in theory explain those symptoms. Since the episodes started after the fuel pump replacement and both times happened while driving you should get back at your mechanic and have it checked again. It is not something which would come out in routine ER tests so you shouldn't be much surprised about that, regular oximeters are of no use, it needs a CO-oximeter or some specific blood tests, spectrophotometric methods, to detect that. I doubt your doctor thought about that (if those tests were at his disposal at all) because it seems to me he attributed your symptoms to anxiety leading to hyperventilating (which in turn lowers carbon dioxide).
If the car check comes out alright though and there is no reason to believe carbon monoxide poisoning, then I must say that judging by the description anxiety does seem indeed the most likely cause, those symptoms may well be in the setting of a panic attack.
I remain at your disposal for further question.


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Detailed Answer:
Thank you for the additional information.
True panic attacks in themselves last about 20-30 minutes, rarely over an hour. However usually they are not isolated but on a setting of anxiety. Anxiety can justify those waxing and waning manifestations you mention without any limit of maximum time.
Adderall as a psychostimulant can be associated with anxiety. As you have been taking it for some time it doesn't necessarily act alone, genetic and stress factors may be involved, but it may be a contributor.
Anyway anxiety is always the last diagnosis to be considered when more serious stuff has been excluded, it is a diagnosis of exclusion. So you should make sure there is no issue with your vehicle. Other causes which may cause such symptoms like heart issues, pulmonary embolism, metabolic alterations I am assuming have been excluded from the EKG and blood tests at the ER.
Let me know if I can further assist you.

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