What both of you have are symtoms, not causes. parasites are normal and do not kill monitors. Sinus infection?????? common gram-negative bacteria, all monitors and you carry those bacteria.
What kills monitors is a surpressed immune system. The immune system cannot function in poor conditions. So the monitors will die of ANYTHING.
As mentioned, monitors feed and feed well. As Jobi mentioned in a recent thread like this, The way a monitor feeds is how you judge its health and reproductive condition.
They eat all the time, in kept properly, they can and do fill up several times a day. They are not snakes, more like birds really.
So if your monitor is alive and does not feed, its all about your husbandry.
As Jobi mentioned, these posts sound like a set up, considering the recent threads.
Just in case they are real, Pick husbandry that works, copy from someone who has done it, not from those who talk about it.
In your cases, visit Pro exotics website and look at their monitor caresheet. They have some experience with wild caughts.
Farm raised, hahahahahahahahahahahaha thats bullbeans. First off, it would be called ranch raised, as farms are for plants, ranches are for live stock. There are no ranches. They may be hatched from eggs from wild caught females, but they are still kept in horrifying conditons, which makes their chance of survival once they reach their final destination, very very poor.
Which is why you really need to have superior conditions to save them, not petshop crap. I wish your monitors luck. Cheers