Peter - I suffer exactly like you. All these blood-sucking creatures make a bee line for me and totally ignore Mrs J.
We lived in Spain some years ago and to start with I was absolutely tormented, but after a while the mosquito bites seemed to react less and less - a sort of immunity. I don't think there are enough of them around here to have the same effect. The other side effect I noticed was that my ears became totally attuned to the frequency of their buzz. I can tell instantly if there is a mosquito in the house and cannot rest until I have tracked it down and eliminated it.
With midges/gnats I can feel them biting a lot, but never get any reactions. I am just hoping that we keep Bluetongue at bay otherwise I would be bound to get it.
As to your plea for help:
A - In the past I have tried various 'guaranteed' repellents. They fall into two categories, those that the dogs are desperate to lick off, and those that aren't. Neither type appears to have any effect on mosquitoes.
B - I find that Hydro-cortisone ointment provides some relief - probably as effective as a few large Scotches if they are keeping you awake, but cheaper!