It absolutely reads like anxiety to me (except for the dermatological issues).
Feeling short of breath (short of an emergency) can cause headaches, dizziness and random pain as a consequence of breathing too much. Left arm goes numb when there's too much tension in the left shoulder. Palpitations can also be related to excessive tension in the upper body, as can the circulation issues.
It doesn't need acute stress for that, just a steady accumulation.
I hope it's not disrespectful, but this is the most common explanation, although it doesn't usually get this bad.
Feeling short of breath (short of an emergency) can cause headaches, dizziness and random pain as a consequence of breathing too much. Left arm goes numb when there's too much tension in the left shoulder. Palpitations can also be related to excessive tension in the upper body, as can the circulation issues.
It doesn't need acute stress for that, just a steady accumulation.
I hope it's not disrespectful, but this is the most common explanation, although it doesn't usually get this bad.