Could i have i 'OD' or something...? or is it just something else completely unrelated?

its most likely from the medicines. you will just have to wait till they are all completely out of your system before you can be 100% it isnt another type of sickness. but in all reality, it is most probably the large amount of medicines you took. sometimes it takes a while for medicine to kick in, and since you have taken a lot of it, they may have all canceled each other out unitl one finally broke through and just caused a chain reaction of side effects.