I wouldn't worry about the miniscule amount of mercury in a CCFL that is found in a monitor.
A study on the amount of mercury from a CCFL tube study states
The New Jersey Department of Environmental Protection states in a report published in 2004 that between 17% and 40% of the mercury is vaporised if CCFLs are broken.
This is over a period of several hours, and a third of the mercury is released over the first eight hours.
In the literature, the amount of mercury in CCFLs varies between 0.1 mg/lamp and 10 mg/lamp
The study goes on to test up to 16 CCFL tubes, basically an entire large TV, smashed in a 31 litre (enclosed) box and while smashing 16 tubes does result in a potentially (long term) dangerous 0.25mg/m3 exposure level after an hour even the vaguest amount of ventilation will almost certainly result in a level well below what is considered "safe".
A single tube being smashed, i.e. the most likely outcome of an accidental drop, would give a tiny amount of vapour that even in a normal sized room probably wouldn't result in a dangerous level. Even so it could be easily combatted by simply opening the window and/or putting the broken device outside.
A brief and temporary exposure is unlikely to result in any significant harm anyway.
If you had a mercury leak then the tube would not work at all and you would have a permanent dark patch because the tube would be cracked and the atmosphere within contaminated and unable to effectively conduct the electrons that produce light. Flickering is a sign of power supply issues rather than cracked CCFL tubes leaking mercury.
There is nothing here to be worried about based on the symptoms you describe. As others note, IF the CCFL were physically broken the monitor would not be working AT ALL. Flickers, drips, stains: these indicate cleanliness issues and possibly pending hardware faults, but if anything they indicate the light bulb is NOT broken and therefore there is NO reason to worry about mercury. – music2myear – 2018-09-05T18:44:06.917
https://m.imgur.com/a/F9zTbfD this is the monitor So if the tube broke my monitor wouldnf work at all? I noticed some stains on the side of my monitor (imgur.com/a/jalj9fQ) and a weird drop off something under the edge of my monitor on top of my PS4 which looked like some dried stuff, could they be related to the Mercury leakage – kyloehre1 – 2018-09-10T13:20:23.777
Multiple people in both comments and answers have now told you that this is not the case. That it is EXTREMELY UNLIKELY that mercury is leaking from your monitor's illumination panels. Further, the amount of mercury in the monitor would not be enough to result in visible drops or droplets. It is difficult to tell what the issue is based on the images you have sent as they are very blurry and indistinct, but we can continue to state categorically that your monitor is NOT leaking mercury. – music2myear – 2018-09-10T20:50:26.923