Hi Tiber,those symptomes are also common for BFS picture. Optical flashes are mostly what is called 'aura'. I had them once but can not remember whether it was when i was taking gabapentine (lyrica) or not... maybe yes, 'cause it was two years ago soon after onset. So it is quite possible

)) Anyway if ophtalmologist does not find any troubles, you may consider this as benign.Many fellows also report 'crawling bug' sensations and other sking sensory issues (wet skin, hot/cold patches, feeling of gum band) etc. Fascial tingling after unpleasant dialog might be caused by hyperventialtion (its main symptomes are fascial numbness, numbness in the distal limbs (fingers/toes) and struggling with the breathing).I wonder sometimes that our symptomes resemble those casued by certain 'enhancment' drugs, like metamphetmines. Mets are known to mess central brain completely, increaing ability of neurons to stay in excited state, causing various processing zones expand and overlap (that is why people can experience very strange body senstaions, including bugs crawling too). Practically phenomenon of numerous somatic symptomes without any substantial physiological changes is intriguing, and because threre are quite a lot of such 'grey zone' conditions, there were some studies performed and I have read recently that neurologists gradually come to idea that we may have combined central and autonomous neural system disregulation causing chaotic response on autonomous level (sudden vessels spasms, swelling of mucosa, urticaria bouts etc.) and at the same time our central brain starts to provide us with the signal which usually are 'technical' and not deliverd to the conscious part of it.It is just like you working on a modern PC and all the BIOS info just pops up here and there on the screen, inluding each and every CPU operation log, temperature etc. Holy crap, it would be a mess!So idea is that we see, hear and sense some extra info from the body, and in some cases we even may have 'interferences' from other analysing parts. So we can hear the light (as tintinnus), see the sounds, for example pulse sound wave (as floaters) and our perception can interpret pulsation of finest capillari in the skin as crawling feeling.it is possible to drop our brain sensitivity down, that is why medication is necessary in some cases, and in some cases it just clams down by itself.