Thank you for your post and welcome to the forum.
To rule out any uncertainties, could you post a picture of your hot end and point out which screw is stuck?
I think I know which one you are talking about, but it wouldn't be the first time where we ended up talking about completely different parts
Like Nallath says, switching from ABS to PLA is not the best idea and should come with a sufficient amount of cleaning.
Have you switched to an Olsson Block?
If so, here you can find the manual on how to finish the assembly.
I think going at it with a pair of pliers is probably your best bet, or alternatively you could also use a file or some kind to make a new engravement in the top so your screwdriver has a better/new grip.
Good luck! Keep us updated.
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nallath 1,124
Switching between ABS & PLA is always difficult. ABS bits get stuck in the nozzle and when printing with PLA they don't get quite hot enough to be pushed out of the nozzle.
I usually print at a higher temperature after i've switched from ABS in oder to purge the nozzle.
I don't have that much experience with dismantling the hotend, but i'm pretty sure others here can help you with that.
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