Ian... Do you have a question about this? It sounds like an allergy/asthma attack (I've had very similar symptoms), but you don't say if you've been diagnosed with either allergies or allergic asthma.
If you do have one of those conditions, then what usually triggers such attacks is being exposed to some sort of allergen, or allergic trigger. Common triggers this time of year are tree and grass pollens, but animals, dust and mold can also be triggers, as can a number of other substances.
You might try keeping a diary of your symptoms, when they come on, what they specifically are, what you were doing shortly before they started, what if anything relieves them, and so forth. Then share this info with your doctor.
Hopefully, together you can develop a treatment plan that will help you feel healthier.
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