It's complicated and I don't feel comfortable going into the details on an open forum like this.
My question was, based on my chart (specifically my 12th and 6th houses since those are the ones associated with mental illness), what mental illnesses would you guess I had?
How do you come by that the 6th and 12th houses are associated with mental illness?
Further to Waybread's comments, you have Gemini, an air (mentality) sign, on the Ascendant....equivalent to the physical constitution. You might say that your window to the outer world is experienced through your mental patterns.
As the ruler of Gemini, Mercury, is also in the second air sign, Libra, this could suggest that 'how you think of others'...or how you think they think of you...plays a very important role in the view you see through your window.
There's a Sun-Mercury conjunction. With an accurate birth time, Sun would be ruler of the 3rd house that is associated with how the immediate environment can effect one's thought processes and, consequently, mental patterns.
The Sun-Mercury squares the generational Uranus-Neptune in Capricorn. a generation born without the restriction and confinement of physical boundaries, that therefore allows and gives free range to all kinds of perceptions.....also mental....in a positive or negative sense. With a harsh aspect, one's thoughts could be as a balloon that gets 'carried away' on the wind, yet without a string that controls them from ground level (reality).
Sun Spirit and Mercury Mind can be weakened by the conjunction, that could suggest irrational thought based upon fantasy, yet just as easily be guided by it towards producing a spirit of mind that is way beyond the limits of today's reality.
The 3 Earth planets are in water houses, which are strongly associated with the forces of the imagination rather than physical practicality. Are things actually as they are perceived?A Moon-Jupiter might tend to exaggerate circumstances beyond their actual physical nature, especially when emotions are heightened by them. Moon-Jupiter can totally believe that what it feels is actually so.
A person may be mentally and/or emotionally disturbed (by its circumstances) at times, yet this does not mean they have a mental illness. Just that they come up against stronger forces that there may be a necessity for them to understand and then control....even if they cannot be fully rationalised.