The yellowish fluid is pus and this indicates there was an active infection at this site.
It is difficult to establish a time-line, whether this was
an intra-surgery or post-surgery complication.
I don't know much about your general health and your medical history, but I suspect some type of connective tissue
disorder, which would be consistent with elevated ANA
with speckled pattern. Further evaluation is necessary.
Your mental and/or biological stress may be chronically
high, which justifies your cortisol suspicion.
Biohealth Labs has a test-as a reference only- called
Adrenal Stress Profile, if you want to look it up.
It is possible you may also have low thyroid function
which could be secondary to low adrenal function
and this would likely not show on standard tests.
Secondary hypothyroidism usually presents as thyroid resistance, where T4 converts to reverse T3, lowering the amount of available T3, which is the thyroid hormone
actually used for the body.
In this scenario the adrenals downregulate thyroid function
for their own recovery, as a survival mechanism.
If you pursue this, ask for free T3, Free T4 and Reverse T3 thyroid tests.
Beware of the delicate nature of treating adrenals and thyroid, simultaneously! Proceeding with the established
treatment protocol for hypothyroidism and not addressing the impaired adrenal function properly, will certainly backfire, after the initial signs of some improvement.
You need to see the knee specialist for your knee, to make sure everything is OK and then consider finding a reputable Functional Medicine doctor to facilitate your return to "normal" health.
It's just to complicated and too aggravating dealing with
Rheumatologists, Endocrinologists, Orthopedic surgeons
etc. and having everything treated in isolation instead of holistically, where everything is interconnected.
Let me know if you need any more info, however, please note that my comments are not intended to replace medical advice.
Best wishes,
Niko