Hi Mandy: All sounds pretty scary for you. I am not sure what is going on but I can say with confidence that it is not GBS. The cardinal manifestation of GBS is paralysis. While some of your symptoms such as pain can occur with GBS it would not occur in the absence of paralysis. There are a number of infections that are spread by mosquito bites such as dengue, zika and others which are extremely unpleasant and can cause many of the symptoms that you describe but are ultimately benign in the vast majority of people affected. I wonder if that might be what you have experienced. I urge you to talk to your doctor about it. It is impossible for me to make a confident diagnosis without seeing you. Gareth