I think the 'fight for survival' is a good term for Mars-Pluto, just as 'a bomb waiting to explode' or 'muscle control' is.
I agree with Caro that the conjunction does not necessarily refer to only illnesses. Mars-Pluto is a powerful asset because it generates the ultimate 'force of will' to overcome the most trying and difficult of situations, especially those that might induce 'the suffering' through 'self pity' associated with some Neptune aspects.
Your chart is very compact and the first thought that came to my mind was one with the words 'ruthless control' in it because of the emphasis upon Scorpio (emotional) and Capricorn (physical), and in their natural houses (as are all the signs). The Scorpio side can suggest the drive of 'hidden forces', in the sense of strong but also obsessional and compelling inner urges. The applying square from Mars to Jupiter could refer to overdoing it and the going to extremes and excesses to 'be the best' and/or exert 'control' within and over non-committal situations (11th house). With Mars ruler of the Ascendant....the physical constitution and personality...it's influence could be exerted through the physical body. The big question would be whether you, yourself, attempt to exert the control or come under its influence from others who would have control over you and your actions.
Virgo on 6th house cusp is ruled by Mercury, which is in a very close conjunction led by Moon and includes Neptune. One's thoughts and feelings should, but might not be 'as grounded' as Capricorn would have them, which could allow negative influences to enter the mind. Similarly, Virgo rules the digestive system, which could mean negative influences work through that area of the body which, in its turn, Pluto would attempt to clear via the colon. (e.g. Nervous excretive system to Crohn's disease to constipation).
generation no longer has 'external barriers' to contend with that hold them back from reaching the ultimate of their aspirations, yet the release from such imagined chains of bondage gives them free rein and does mean taking 'inner control'. Your chart shows the conjunction sextile Pluto. You may feel driven to think in terms of possible weaknesses instead of strength, whilst Sun sextile Mars shows you do possess the stamina and strength for 'body building' and taking care of yourself.
I'm still trying to learn more about how things work and any information that can help give me some context and help me start learning how my chart and my health issues might be connected would be appreciated.
You say that people and dr's are not concerned with you or for your illnesses of recent years (as per feelings of abandonment?). Does this mean that medical science can find no physical reasons and cause for your ailments?
A simple answer may be a necessity to interchange 'yes' with 'no' where your actions, thoughts and feelings are concerned, whereby your physical strength is given the opportunity to improve?