You must have something to look forward to every day.
A tv programme.
15 minutes p&q in the bath.
10 minutes dancing round your living room with the music up high (daytime, so as not to upset the neighbours)
A walk to a cafe for a cup of tea and a bacon sarnie that you haven't cooked
Half an hour doing a jigsaw, crossword, knitting, learning French - whatever you like but don't feel guilty about it.
Make a note of worrying symptoms and the date and forget them. Tell yourself if you still have the symptoms in one month you will see your GP and accept his advice - if he says he can see no hairs growing out of your chin, there is no hairs. If he refers you to a specialist, go, but don't expect the worse.
Ask your GP to be referred for counselling. There is nothing like telling somebody all your troubles to realise how daft you sound. Or to realise there is a problem that needs sorting.
Volunteer. An hour a week at your local charity shop; or feed an old person in hosptial; or pick litter once a month.
Think about all your old anxieties. Make a list. Cross of every one that was false. Your bad back wasn't cancer of the spine (or whatever). Cross it off. What's left? Think about them as if you were listening to your best friend.
You know you are over anxious - that is very good. It means you can remind yourself to make allowances for yourself, and to relax - see how you feel in the morning, next week, whenever.
Please remember, whatever it is, good or bad, will pass.