I have found two scenarios that when i imagine cause profuse unrelenting physical crying almost like a purely physical manifestation of grief but no emotional side to it, and the two scenarios are unrelated and have no history attached to them or anything, one i discovered in childhood and the next i discovered about 15 years later in my 20s during meditation
the childhood scenario i discovered is if i imagine myself having powers, which i believe stemmed from my interest in superman etc but the imagined scenario involves more of an omnipotence side, which when i imagine myself there for whatever reason causes involuntary constant crying that borderline blurs my ability to even think about it properly so i have mostly ignored it
the second scenario i noticed during meditation one day randomly, i was using visual imagery and wanted to imagine myself underneath a tree which sparked instantaneously the exact same experience, and i cried relentlessly and unstoppably for 30 minutes straight trying to understand it and i just couldn't with so much physical effect clouding me from doing so
because of such severe physical sensation i have never fully been able to think or understand about either situation, i cannot imagine the specifics of the powers, or in the tree secenario i cannot place a specific tree or area, but if i imagine something like laying by a tree its perfectly fine and extremely vivid, the effect also happens whether i imagine myself in 1st or 3rd person in respective scenarios