Parasites in stools? VERY SICK PLEASE HELP

So for the past week and a half I have been having some symptoms of diarrhea and harsh pains combined with a very discomforting warmth sensation around my lower stomach/abdomen area. This has been progressively getting worse by the day and it is causing me some nausea and in some cases I have been close to vomiting.

Around 2 days ago I went and saw my GP and explained to him all the symptoms I was having and that I suspected it may have been related to parasytes (worms) and he had said this this was highly unlikely to be the case as I live in the UK and hadn't been abroad recently so he had sent me home and the discomforting pains and diarrhea is still proceeding to get worse.

Today I had notice these strange rather clear almost thread type substances within my stools so I had the impression come over me that this could be related to a possible parsyte possibly the tapeworm in particular so I had decided to take two pictures and had stumbled across this website so I will highly appreciate any feedback as to what may be the cause of my symptoms and the solutions I can take to cure them? 

Thanks