Is this Dangerous?
Was this dangerous? No. It does not cause any physical or mental harm. It happened because the energies were high and allowed me to expand beyond the minds comfort limits. So, how does one control an expansion The conscious mind needs to realize the limits that the expansion is at. Once its comfort limits are reached, then allow no further expansion. At first, this may be done by withdrawing from the meditation, but with experience, one learns to control the area or mass of expansion or the space enclosed by the expansion.
Controlling the Expansion
One technique to do this is by visualizing a path, or road, or perhaps a string, or a line, or something that connects with the beginning of the meditation. Therefore, realizing that you may follow this back to the beginning and therefore not become lost or expand beyond a set limit. If a line or string or ribbon is used, a predetermined amount can be chosen and that will stop the expansion once the end is reached. Or if a path or road or a visible object that you follow is used, then a landmark may be selected at which point you will return or not past beyond. After each successive meditation, the length of line or landmark may be comfortably extended. The basic concept is that your mind should control the situation.
Progression of the Expansion
With more experience, the sensation of the heavy feeling never reoccurred and the the sensation changed to feeling like I was just taking a step beyond my body.
The experience of a soul expansion can be an enjoyable sensation. It can also serve as a validation of progression in the spiritual development process.