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Yes, it's true. Strong emotions such as elation, ecstasy, unrestrained joy, and jubilation can cause severe stress in the body, since the mechanism of stress in the body is the same for any type of emotion. We know that stress is a person's physiological response to a perceived threat, demand, or problem that needs to be addressed. The body's response to stress is a “fight, flight, or freeze” response. It occurs regardless of whether the nature of stress is positive or negative.
Yes, if stress is understood as a set of non-specific adaptive normal reactions of the body to sudden changes in the body's homeostasis, as well as the corresponding state of the body's nervous system or the body as a whole. Strong emotions arise in response to changes in the body-environment ratio and manifest themselves in biochemical changes, so they are both a deviation from homeostasis and its consequence. Regardless of the sign.
Psychologists distinguish the concept of positive stress – eustress, and negative stress-distress, leading to various diseases, if it lasts too long. So, whether a positive emotion, or any other, will be a source of distress depends on many factors, including the person's attitude to their own emotions and stress.
There is an interesting video on TED.com – “How to make friends with stress” ted.com
From the point of view of pathological and normal physiology, positive and negative emotions cause exactly the same processes in the body. The most obvious change is nervous excitation, i.e. the accumulation of nerve impulses (from the point of view of physical chemistry – electric charges). Excessive arousal causes stress, the pathophysiology of which is described in detail in many works, starting with Hans Selye, who introduced this concept.