[Theorsell]

1. Is it true that sudden abundant dhikr can be mentally harmful?

I have heard this being alluded to by many people.

2. If the answer to question 1 is in the affirmitive, how is it that remembering/taking the name of Allah can be harmful?

3. Are there any experts in Tasawwuf that can answer this?

I think the people who say this arent refering to basic dhikr - like saying the kalima all day - I think they are refering to higher level Awrad and the person using these higher level awarad against the advice of a compitent Murshid or using them with no Murshid - causing them to go into a state of jazb