Looking at this one picture, correct me if I am wrong, but every little branch off the main stem with a little white ring has drooped or lost their turgidity. When you said 'pus' were there softer moister white material where those white rings are now?
Sigh, hope I am wrong, but moist, swollen, bruised looking nodes with white crap oozing out is usually Sclerotinia sclerotiorum or White Mold. Not cool, if this is what it is and we shall soon find out for sure. This mold actually makes incredible CAPSULES so when the plant dies (which it will there is NO TREATMENT) that capsule (looks like a rabbit or hamster poo pellet)will innoculate the soil with itself to be passed on to other plants/crops. It probably came in with your plant from the nursery. IF I AM RIGHT.
Those branches that have drooped probably are full of these quite large black soft capsules. If you could, please get a razor blade, cut off one of these branches without damaging the main stem for now. Try to cut the base of that branch lengthwise. Look back at where you cut away the branch on the main stem. You might be able to see these capsules there as well...they will be 1/4" to 1/2" oblong. If there are black capsules that plant needs to be destroyed, not just thrown away. Sorry if that is what you find!! The soil, every bit of it carefully sequestered in a plastic trash liner AND then a second one for good measure. The pot soaked in a solution of bleach. Heck, I'd probably put that in the plastic bags as well!
This ONE little fungus is one heck of a plant destroyer. It is the cause of billions of dollars of cash crops especially soy beans. Horribly contagious and runs the gamut of plant families. Please try this dissection, take a picture and please send. Keep this plant away from all other plants/soil/pruners until we've been able to eliminate white mold as the problem.
There is no treatment at all for this disease. No hope for any plant that has this particular fungus. So get a razor blade, be careful, use newspaper under your plant and surgery and wash your hands afterwards like a doctor!!
examples of Sclerotinia White Mold