Mercury retrograde is generally associated with communication and technology breakdowns, nervous anxiety, travel delays, and lost items. You may reminisce about the past or unexpectedly meet up with people from your past. Business negotiations are often in a state of flux during Mercury retrograde, with some important details not yet available.
This particular Mercury retrograde 2019 is very intense and combative because it is conjunct Mars. It is also impulsive and provocative because it is square Uranus. Nervous and rushed thinking brings the potential for losing your temper and getting in arguments.
Mercury retrograde July 2019 requires self-awareness, concentration, patience and impulse control. Chose your battles carefully and avoid making spontaneous decisions. A tendency to act rashly without regard for the consequences could lead to great disruption or conflict.
Looks like the Celestial is in reverse gear so if your inner life strays back in time, seen form an Astro point of view that could be the explanation.