If you’ve been on holiday or in fresh water (non salted water) then you could’ve contracted a worm or parasite. I’d probably go to the doctor and seek their professional help. Hope you get better
Is there something you have been exposed to/eaten that could have given you worms? If you are having these symptoms, you should probably just head to your doctor- they will be able to treat you and do more then just take a guess at what could be happening. Feel better soon!