I honestly think it's worth going to see your doctor asap.
I know you think they wont take you seriously, but just from reading what you wrote I can tell how much distress this is causing you, and anything that is making you feel this stressed and concerned is definitely something you should get checked out. There are steps your doctor can take to help you, have you thought about seeing a psychiatrist or therapist, or even talking to a close friend or family member? Someone who you can really trust.
In answer to something you mentioned toward the end of your post, no I personally don't think it's a normal thing to experience and even though I can't relate to most things you've written, I've researched A LOT into that type of thing because I get extreme anxiety and paranoia, which turned up a few surprising search results, schizophrenia being one of them. Maybe check out the NHS website to help you get an idea of the symptoms you're dealing with, and perhaps print off all the ones that mostly apply to you and take them with you to your doctor, and work through the symptoms with them. I'm not trying to give you a diagnosis or anything like that, I'm not a doctor so I'm not qualified to notice these sorts of things, but I do think that it sounds like something you really should go to a doctor about. If they do turn you away, persist and keep coming back because if the problem hasn't cleared up already, it's unlikely that it will without some help. Saying that though, try not to get too worried about it, just consider the fact that it could be something more serious.
I hope nothing here was offensive, it's just my opinion
:) x
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