Re: Weird weird feeling - help!!
It all sounds pretty normal. I fear the anxiety has created a habit regarding the 'checking', and this has got so bad that you're dreaming about it and conscious of it the very second you awake.
The screaming is nasty. My wife had the "wake in the night desperately checking to see if OK" and sweated terribly but she didn't scream. It ruined her sleep though, which made her tired, which made her less able to cope with worries and problems....a vicious circle. She falls asleep to kids stories on the iPod now.
Ignore the numb feeling. You're not some super genius who is capable of feeling a tumour by magic.
The doctor is in charge of what you do regarding the lump/antibiotics and you must trust what they say.
I'm afraid that extreme worry, in some people, can cause stomach aches which might feel (to you) like something dreadful. As an IBS sufferer myself, I know those can feel very vicious, and vary with stress levels. If you were only able to calm yourself, you'd find many of these pains would go away. I know its difficult; most people find they need the help of seratonin tablets to help them cope with daily life, before they have the mental strength to undertake the CBT which can help them gradually.
Describe to your doctor the level of worry you have, and how it impacts your daily life (including the sleeping). Anxiety isn't just someone "being silly", it is recognised on the NHS, and you will get some help.
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I do not suffer from Health Anxiety, but I have supported my wife through 12 years of battling with it.