Don't worry about it mate. Chill out. Deep breaths. Calm, relaxations, de-stress.
The brain is a very powerful thing. Psychologically you can cause yourself serious symptoms, or amplify mild symptoms that are already there. I know this from personal experience too.
What do you think stress is? There is no physical cause of it really, yet people can make them selves physically sick. Stress can cause dizziness, nausia, eye strain, head aches, heart palpatations etc. If you get heart palpations and you thing you're having a heart attack, it can induce a panic attack. Suddenly you can't breath. It all gets worse. Blah blah. All this from zero physical symptoms.
If you're the soft of paranoid bloke who thinks he has a brain tumour everytime he gets a head ache, then you're the sort of person who can potentially make themselves feel very ill from nothing.
Here's what I would say - you have to go to the doctor. I personally reckon there is nothing wrong with you, but if you're a paranoid psycho, you'll never be able to convince yourself you're ok. It goes against your nature. But when you talk to the doctor and they tell you you're ok, suddenly you'll feel so much better.
There may be an underlying cause, but it definitely sounds like you're a bit like me (but probably more extreme) and just paranoid about your health. You have to go to a doctor to put your mind at rest otherwise you'll always think you're on the brink of death.
