I have never heard of anyone who gets so worked up about heat.
The OP suffers from a recognised mental health disorder, that is debilitating & distressing &.chronic in nature.
It has been diagnosed by a medical professional. For her specifically it can be triggered & exacerbated by hot weather.
She is receiving treatment in the form of psychological therapy &/or medication. She is not “self-diagnosed”.
We had never heard of anxiety disorders back then, and even now, while I do know people with them (often self-diagnosed) I
Perhaps you should evolve then.
Improvements in knowledge of & understanding of anxiety resulted in Generalized Anxiety Disorder being recognised as a separate & specific mental health disorder by the diagnostic manual for psychiatric conditions (DSM) in 1980 with other anxiety disorders being included over time.
Namely Panic Disorder, Post-Traumatic Stress Disorder (PTSD), Social Phobia (or Social Anxiety Disorder). OCD (Obsessive Compulsive Disorder) is now included under a separate section.
So would you have any sympathy if it was say a male ex veteran suffering from PTSD (maybe a condition you have more knowledge of & possibly more belief in?) for whom standing in front of & managing and teaching a class of disruptive kids, would feel particularly challenging, were he to experience a panic attack, which is a core symptom of PTSD (along with a host of distressing & disabling other symptoms)?
Would you feel confident if all of a sudden, you would start hyperventilating, difficulty breathing, chest pains, feeling so overwhelmingly terrified that you believe you are going to die, dissociating from your body, being unable to stand, think, speak or see clearly, needing time to recover from it, where typically you will feel exhausted, weak & incredibly. embarrassed/stupid/ashamed)? When at your place of work? In front of a class of school kids?
The OP isn’t “worked up” about anything. She’s trying to work out how she manages her job alongside a horrible, debilitating & difficult to manage health condition.
Have some sympathy.